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 <body class="h-entry">
  <div class="head">
   <p data-fill-with="logo"><a class="logo" href="https://www.w3.org/"> <img alt="W3C" height="48" src="https://www.w3.org/StyleSheets/TR/2016/logos/W3C" width="72"> </a> </p>
   <h1 class="p-name no-ref" id="title">CSS Snapshot 2017</h1>
   <h2 class="no-num no-toc no-ref heading settled" id="subtitle"><span class="content">W3C Note, <time class="dt-updated" datetime="1970-01-01">1 January 1970</time></span></h2>
   <div data-fill-with="spec-metadata">
    <dl>
     <dt>This version:
     <dd><a class="u-url" href="https://www.w3.org/TR/1970/NOTE-css-2017-0-19700101/">https://www.w3.org/TR/1970/NOTE-css-2017-0-19700101/</a>
     <dt>Latest published version:
     <dd><a href="https://www.w3.org/TR/CSS/">https://www.w3.org/TR/CSS/</a>
     <dt>Editor's Draft:
     <dd><a href="https://drafts.csswg.org/css-2017/">https://drafts.csswg.org/css-2017/</a>
     <dt class="editor">Editors:
     <dd class="editor p-author h-card vcard" data-editor-id="42199"><a class="p-name fn u-url url" href="http://xanthir.com/">Tab Atkins Jr.</a> (<span class="p-org org">Google</span>)
     <dd class="editor p-author h-card vcard" data-editor-id="35400"><a class="p-name fn u-url url" href="http://fantasai.inkedblade.net/contact">Elika J. Etemad / fantasai</a> (<span class="p-org org">Invited Expert</span>)
     <dd class="editor p-author h-card vcard" data-editor-id="43241"><a class="p-name fn u-url url" href="https://florian.rivoal.net">Florian Rivoal</a> (<span class="p-org org">Invited Expert</span>)
     <dt>Suggest an Edit for this Spec:
     <dd><a href="https://github.com/w3c/csswg-drafts/blob/master/css-2017-0/Overview.bs">GitHub Editor</a>
     <dt>Issue Tracking:
     <dd><a href="https://github.com/w3c/csswg-drafts/labels/css-2017-0">GitHub Issues</a>
    </dl>
   </div>
   <div data-fill-with="warning"></div>
   <p class="copyright" data-fill-with="copyright"><a href="https://www.w3.org/Consortium/Legal/ipr-notice#Copyright">Copyright</a> © 1970 <a href="https://www.w3.org/"><abbr title="World Wide Web Consortium">W3C</abbr></a><sup>®</sup> (<a href="https://www.csail.mit.edu/"><abbr title="Massachusetts Institute of Technology">MIT</abbr></a>, <a href="https://www.ercim.eu/"><abbr title="European Research Consortium for Informatics and Mathematics">ERCIM</abbr></a>, <a href="https://www.keio.ac.jp/">Keio</a>, <a href="https://ev.buaa.edu.cn/">Beihang</a>). W3C <a href="https://www.w3.org/Consortium/Legal/ipr-notice#Legal_Disclaimer">liability</a>, <a href="https://www.w3.org/Consortium/Legal/ipr-notice#W3C_Trademarks">trademark</a> and <a href="https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document">permissive document license</a> rules apply. </p>
   <hr title="Separator for header">
  </div>
  <div class="p-summary" data-fill-with="abstract">
   <h2 class="no-num no-toc no-ref heading settled" id="abstract"><span class="content">Abstract</span></h2>
   <p>This document collects together into one definition all the specs that

	together form the current state of Cascading Style Sheets (CSS) as of 2017.
	The primary audience is CSS implementers, not CSS authors, as this definition
	includes modules by specification stability, not Web browser adoption rate.</p>
    <a href="https://www.w3.org/TR/CSS/">CSS</a> is a language for describing the rendering of structured documents
(such as HTML and XML)
on screen, on paper, etc. 
  </div>
  <h2 class="no-num no-toc no-ref heading settled" id="status"><span class="content">Status of this document</span></h2>
  <div data-fill-with="status"> This document represents the state of CSS as of 2017.
	The CSS Working Group does not expect any further changes to this document:
	new snapshots will be published at <a href="https://www.w3.org/TR/CSS/">https://www.w3.org/TR/CSS/</a> as CSS advances. </div>
  <div data-fill-with="at-risk"></div>
  <nav data-fill-with="table-of-contents" id="toc">
   <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
   <ol class="toc" role="directory">
    <li>
     <a href="#intro"><span class="secno">1</span> <span class="content">Introduction</span></a>
     <ol class="toc">
      <li><a href="#w3c-process"><span class="secno">1.1</span> <span class="content"> Background: The W3C Process and CSS</span></a>
     </ol>
    <li>
     <a href="#css"><span class="secno">2</span> <span class="content">Cascading Style Sheets (CSS) — The Official Definition</span></a>
     <ol class="toc">
      <li><a href="#css-levels"><span class="secno">2.1</span> <span class="content"> CSS Levels</span></a>
      <li><a href="#profiles"><span class="secno">2.2</span> <span class="content"> CSS Profiles</span></a>
     </ol>
    <li>
     <a href="#responsible"><span class="secno">3</span> <span class="content"> Requirements for Responsible Implementation of CSS</span></a>
     <ol class="toc">
      <li><a href="#partial"><span class="secno">3.1</span> <span class="content">Partial Implementations</span></a>
      <li>
       <a href="#future-proofing"><span class="secno">3.2</span> <span class="content">Implementations of Unstable and Proprietary Features</span></a>
       <ol class="toc">
        <li><a href="#experimental"><span class="secno">3.2.1</span> <span class="content"> Experimentation and Unstable Features</span></a>
        <li><a href="#proprietary"><span class="secno">3.2.2</span> <span class="content"> Proprietary and Non-standardized Features</span></a>
        <li><a href="#de-facto"><span class="secno">3.2.3</span> <span class="content"> Market Pressure and De Facto Standards</span></a>
       </ol>
      <li><a href="#testing"><span class="secno">3.3</span> <span class="content">Implementations of CR-level Features</span></a>
     </ol>
    <li>
     <a href="#indices"><span class="secno">4</span> <span class="content">Indices</span></a>
     <ol class="toc">
      <li><a href="#terms"><span class="secno">4.1</span> <span class="content">Terms Index</span></a>
      <li><a href="#selectors"><span class="secno">4.2</span> <span class="content">Selector Index</span></a>
      <li><a href="#at-rules"><span class="secno">4.3</span> <span class="content"> At-Rule Index</span></a>
      <li><a href="#properties"><span class="secno">4.4</span> <span class="content">Property Index</span></a>
      <li><a href="#values"><span class="secno">4.5</span> <span class="content">Values Index</span></a>
     </ol>
    <li><a href="#acks"><span class="secno">5</span> <span class="content">Acknowledgements</span></a>
    <li>
     <a href="#conformance"><span class="secno"></span> <span class="content"> Conformance</span></a>
     <ol class="toc">
      <li><a href="#document-conventions"><span class="secno"></span> <span class="content"> Document conventions</span></a>
      <li><a href="#conform-classes"><span class="secno"></span> <span class="content"> Conformance classes</span></a>
      <li>
       <a href="#conform-responsible"><span class="secno"></span> <span class="content"> Requirements for Responsible Implementation of CSS</span></a>
       <ol class="toc">
        <li><a href="#conform-partial"><span class="secno"></span> <span class="content"> Partial Implementations</span></a>
        <li><a href="#conform-future-proofing"><span class="secno"></span> <span class="content"> Implementations of Unstable and Proprietary Features</span></a>
        <li><a href="#conform-testing"><span class="secno"></span> <span class="content"> Implementations of CR-level Features</span></a>
       </ol>
     </ol>
    <li>
     <a href="#index"><span class="secno"></span> <span class="content">Index</span></a>
     <ol class="toc">
      <li><a href="#index-defined-here"><span class="secno"></span> <span class="content">Terms defined by this specification</span></a>
      <li><a href="#index-defined-elsewhere"><span class="secno"></span> <span class="content">Terms defined by reference</span></a>
     </ol>
    <li>
     <a href="#references"><span class="secno"></span> <span class="content">References</span></a>
     <ol class="toc">
      <li><a href="#normative"><span class="secno"></span> <span class="content">Normative References</span></a>
      <li><a href="#informative"><span class="secno"></span> <span class="content">Informative References</span></a>
     </ol>
   </ol>
  </nav>
  <main>
   <h2 class="heading settled" data-level="1" id="intro"><span class="secno">1. </span><span class="content">Introduction</span><a class="self-link" href="#intro"></a></h2>
   <p>When the first CSS specification was published,
	all of CSS was contained in one document that defined CSS Level 1.
	CSS Level 2 was defined also by a single, multi-chapter document.
	However for CSS beyond Level 2,
	the CSS Working Group chose to adopt a modular approach,
	where each module defines a part of CSS,
	rather than to define a single monolithic specification.
	This breaks the specification into more manageable chunks
	and allows more immediate, incremental improvement to CSS.</p>
   <p>Since different CSS modules are at different levels of stability,
	the CSS Working Group has chosen to publish this profile
	to define the current scope and state of Cascading Style Sheets as of mid 2017.
	This profile includes only specifications that we consider stable <em>and</em> for which we have enough implementation experience that we are sure of that stability.</p>
   <p class="note" role="note"><span>Note:</span> This is not intended to be a CSS Desktop Browser Profile:
	inclusion in this profile is based on feature stability only
	and not on expected use or Web browser adoption.
	This profile defines CSS in its most complete form.</p>
   <p class="note" role="note"><span>Note:</span> Although we don’t anticipate significant changes to the specifications that form this snapshot,
	their inclusion does not mean they are frozen.
	The Working Group will continue to address problems as they are found in these specs.
	Implementers should monitor <a href="http://lists.w3.org/Archives/Public/www-style/">www-style</a> and/or the <a href="http://www.w3.org/blog/CSS">CSS Working Group Blog</a> for any resulting changes, corrections, or clarifications.</p>
   <h3 class="heading settled" data-level="1.1" id="w3c-process"><span class="secno">1.1. </span><span class="content"> Background: The W3C Process and CSS</span><a class="self-link" href="#w3c-process"></a></h3>
   <p><em>This section is non-normative.</em></p>
   <p>In the <a href="http://www.w3.org/Consortium/Process/">W3C Process</a>,
	a Recommendation-track document passes through three levels of stability,
	summarized below:</p>
   <dl>
    <dt>Working Draft (WD) 
    <dd>
     <p>This is the design phase of a W3C spec.
			The WG iterates the spec in response to internal and external feedback.</p>
     <p>The first official Working Draft is designated the “First Public Working Draft” (FPWD).
			In the CSSWG, publishing FPWD indicates that the Working Group as a whole has agreed to work on the module,
			roughly as scoped out and proposed in the editor’s draft.</p>
     <p>The transition to the next stage is sometimes called “Last Call Working Draft” (LCWD) phase.
 			The CSSWG transitions Working Drafts once we have resolved all known issues,
 			and can make no further progress without feedback from building tests and implementations.</p>
     <p>This “Last Call for Comments” sets a deadline for reporting any outstanding issues,
			and requires the WG to specially track and address incoming feedback.
			The comment-tracking document is the Disposition of Comments (DoC).
			It is submitted along with an updated draft for the Director’s approval,
			to demonstrate wide review and acceptance.</p>
    <dt>Candidate Recommendation (CR) 
    <dd>
      This is the testing phase of a W3C spec.
			Notably, this phase is about using tests and implementations to test the specification:
			it is not about testing the implementations.
			This process often reveals more problems with the spec,
			and so a Candidate Recommendation will morph over time in response to implementation and testing feedback,
			though usually less so than during the design phase (WD). 
     <p>Demonstration of two correct, independent implementations of each feature is required to exit CR,
			so in this phase the WG builds a test suite and generates implementation reports.</p>
     <p>The transition to the next stage is “Proposed Recommendation” (PR).
			During this phase the W3C Advisory Committee must approve the transition to REC.</p>
    <dt>Recommendation (REC) 
    <dd> This is the completed state of a W3C spec and represents a maintenance phase.
			At this point the WG only maintains an errata document
			and occasionally publishes an updated edition that incorporates the errata back into the spec. 
   </dl>
   <p>An <dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="editors-draft">Editor’s Draft</dfn> is effectively a live copy of the editors’ own working copy.
	It may or may not reflect Working Group consensus,
	and can at times be in a self-inconsistent state.
	(Because the publishing process at W3C is time-consuming and onerous,
	the <a data-link-type="dfn" href="#editors-draft" id="ref-for-editors-draft">Editor’s Draft</a> is usually the best (most up-to-date) reference for a spec.
	Efforts are currently underway to reduce the friction of publishing,
	so that official drafts will be regularly up-to-date
	and <span id="ref-for-editors-draft①">Editor’s Drafts</span> can return to their original function as scratch space.)</p>
   <h2 class="heading settled" data-level="2" id="css"><span class="secno">2. </span><span class="content">Cascading Style Sheets (CSS) — The Official Definition</span><a class="self-link" href="#css"></a></h2>
   <p>As of 2017, <dfn data-dfn-type="dfn" data-noexport id="cascading-style-sheets-css">Cascading Style Sheets (CSS)<a class="self-link" href="#cascading-style-sheets-css"></a></dfn> is defined by the following
	specifications.</p>
   <dl>
    <dt><a href="https://www.w3.org/TR/CSS2/">CSS Level 2, latest revision</a> (including errata) <a data-link-type="biblio" href="#biblio-css2">[CSS2]</a> 
    <dd> This defines the core of CSS, parts of which are overridden by later specifications.
				We recommend in particular reading <a href="https://www.w3.org/TR/CSS2/intro.html">Chapter 2</a>,
				which introduces some of the basic concepts of CSS
				and its design principles. 
    <dt><a href="https://www.w3.org/TR/css-syntax-3/">CSS Syntax Level 3</a> <a data-link-type="biblio" href="#biblio-css-syntax-3">[CSS-SYNTAX-3]</a> 
    <dd> Replaces CSS2§4.1, CSS2§4.2, CSS2§4.4, and CSS2§G,
			defining how CSS is parsed. 
    <dt><a href="https://www.w3.org/TR/css-style-attr/">CSS Style Attributes</a> <a data-link-type="biblio" href="#biblio-css-style-attr">[CSS-STYLE-ATTR]</a> 
    <dd> Defines how CSS declarations can be embedded in markup attributes. 
    <dt><a href="https://www.w3.org/TR/css3-mediaqueries/">Media Queries Level 3</a> <a data-link-type="biblio" href="#biblio-css3-mediaqueries">[CSS3-MEDIAQUERIES]</a> 
    <dd> Replaces CSS2§7.3 and expands on the syntax for media-specific styles. 
    <dt><a href="https://www.w3.org/TR/css3-conditional/">CSS Conditional Rules Level 3</a> <a data-link-type="biblio" href="#biblio-css3-conditional">[CSS3-CONDITIONAL]</a> 
    <dd> Replaces CSS2§7.2, updating the definition of <a class="css" data-link-type="maybe" href="https://drafts.csswg.org/css-conditional-3/#at-ruledef-media" id="ref-for-at-ruledef-media">@media</a> rules to allow nesting,
			and introduces <a class="css" data-link-type="maybe" href="https://drafts.csswg.org/css-conditional-3/#at-ruledef-supports" id="ref-for-at-ruledef-supports">@supports</a> rules for feature-support queries. 
    <dt><a href="https://www.w3.org/TR/css3-namespace/">CSS Namespaces</a> <a data-link-type="biblio" href="#biblio-css3-namespace">[CSS3-NAMESPACE]</a> 
    <dd> Introduces an <span class="css">@namespace</span> rule to allow namespace-prefixed selectors. 
    <dt><a href="https://www.w3.org/TR/css3-selectors/">Selectors Level 3</a> <a data-link-type="biblio" href="#biblio-select">[SELECT]</a> 
    <dd> Replaces CSS2§5 and CSS2§6.4.3, defining an extended range of selectors. 
    <dt><a href="https://www.w3.org/TR/css3-cascade/">CSS Cascading and Inheritance Level 3</a> <a data-link-type="biblio" href="#biblio-css-cascade-3">[CSS-CASCADE-3]</a> 
    <dd> Replaces CSS2§1.4.3 and CSS2§6 
    <dt><a href="https://www.w3.org/TR/css3-values/">CSS Values and Units Level 3</a> <a data-link-type="biblio" href="#biblio-css-values-3">[CSS-VALUES-3]</a> 
    <dd> Replaces CSS2§1.4.2.1, CSS2§4.3, and CSS2§A.2.1–3,
			defining CSS’s property definition syntax
			and expanding its set of units. 
    <dt><a href="https://www.w3.org/TR/css3-color/">CSS Color Level 3</a> <a data-link-type="biblio" href="#biblio-css3-color">[CSS3-COLOR]</a> 
    <dd> Replaces CSS2§4.3.6, CSS2§14.1, and CSS2§18.2,
			defining an extended range of color values.
			Also introduces the <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-color-4/#propdef-opacity" id="ref-for-propdef-opacity">opacity</a> property. 
    <dt><a href="https://www.w3.org/TR/css3-background/">CSS Backgrounds and Borders Level 3</a> <a data-link-type="biblio" href="#biblio-css3-background">[CSS3-BACKGROUND]</a> 
    <dd> Replaces CSS2§8.5 and CSS2§14.2,
			providing more control of backgrounds and borders,
			including layered background images,
			image borders,
			and drop shadows. 
    <dt><a href="https://www.w3.org/TR/css3-images/">CSS Image Values and Replaced Content Level 3</a> <a data-link-type="biblio" href="#biblio-css3-images">[CSS3-IMAGES]</a> 
    <dd> Provides a new foundation text for the sizing of replaced elements (such as images),
			adds additional controls to their sizing and orientation,
			and introduces syntax for gradients as images in CSS. 
    <dt><a href="https://www.w3.org/TR/css-fonts-3/">CSS Fonts Level 3</a> <a data-link-type="biblio" href="#biblio-css-fonts-3">[CSS-FONTS-3]</a> 
    <dd> Replaces CSS2§15
			and provides more control over font choice and feature selection. 
    <dt><a href="https://www.w3.org/TR/css3-multicol/">CSS Multi-column Layout Level 1</a> <a data-link-type="biblio" href="#biblio-css3-multicol">[CSS3-MULTICOL]</a> 
    <dd> Introduces multi-column flows to CSS layout. 
    <dt><a href="https://www.w3.org/TR/css3-ui/">CSS User Interface Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-ui-3">[CSS-UI-3]</a> 
    <dd> Replaces CSS2§18.1 and CSS2§18.4,
			defining <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css3-ui/#propdef-cursor" id="ref-for-propdef-cursor">cursor</a>, <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css3-ui/#propdef-outline" id="ref-for-propdef-outline">outline</a>, and several new CSS features that also enhance the user interface. 
    <dt><a href="https://www.w3.org/TR/compositing-1/">CSS Compositing and Blending Level 1</a> <a data-link-type="biblio" href="#biblio-compositing">[COMPOSITING]</a> 
    <dd> Defines the compositing and blending of overlaid content
			and introduces features to control their modes. 
    <dt><a href="https://www.w3.org/TR/css-writing-modes-3/">CSS Writing Modes Level 3</a> <a data-link-type="biblio" href="#biblio-css-writing-modes-3">[CSS-WRITING-MODES-3]</a> 
    <dd> Defines CSS support for various international writing modes,
			such as left-to-right (e.g. Latin or Indic),
			right-to-left (e.g. Hebrew or Arabic),
			bidirectional (e.g. mixed Latin and Arabic) and vertical (e.g. Asian scripts). 
   </dl>
   <div class="note" role="note">
     The following modules are widely deployed with <a data-link-type="dfn" href="#rough-interoperability" id="ref-for-rough-interoperability">rough interoperability</a>,
		but the details are not fully worked out
		and they need more testing and bugfixing. 
    <dl>
     <dt><a href="https://www.w3.org/TR/css3-transitions/">CSS Transitions Level 1</a> <a data-link-type="biblio" href="#biblio-css3-transitions">[CSS3-TRANSITIONS]</a> and <a href="https://www.w3.org/TR/css3-animations/">CSS Animations Level 1</a> <a data-link-type="biblio" href="#biblio-css3-animations">[CSS3-ANIMATIONS]</a> 
     <dd> Define mechanisms for transitioning the computed values of CSS properties over time. 
     <dt><a href="https://www.w3.org/TR/css-flexbox-1/">CSS Flexible Box Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-flexbox-1">[CSS-FLEXBOX-1]</a> 
     <dd> Introduces a flexible linear layout model for CSS. 
     <dt><a href="https://www.w3.org/TR/css3-transforms/">CSS Transforms Level 1</a> <a data-link-type="biblio" href="#biblio-css3-transforms">[CSS3-TRANSFORMS]</a> 
     <dd> Introduces graphical transformations to CSS. 
     <dt><a href="https://www.w3.org/TR/css-variables-1/">CSS Custom Properties for Cascading Variables Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-variables-1">[CSS-VARIABLES-1]</a> 
     <dd> Introduces cascading variables as a new primitive value type that is accepted by all CSS properties,
				and custom properties for defining them. 
     <dt><a href="https://www.w3.org/TR/css-text-3/">CSS Text Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-text-3">[CSS-TEXT-3]</a> 
     <dd> Defines properties for text manipulation and specifies their processing model.
				It covers line breaking, justification and alignment, white space handling, and text transformation. 
    </dl>
   </div>
   <div class="note" role="note">
     The following modules have completed design work,
		and are fairly stable,
		but have not received much testing and implementation experience yet: 
    <dl>
     <dt><a href="https://www.w3.org/TR/css-counter-styles-3/">CSS Counter Styles Level 3</a> <a data-link-type="biblio" href="#biblio-css-counter-styles-3">[CSS-COUNTER-STYLES-3]</a> 
     <dd> Expands the possible values of <a class="production css" data-link-type="type" href="https://www.w3.org/TR/css-counter-styles-3/#typedef-counter-style" id="ref-for-typedef-counter-style" title="Expands to: simp-chinese-formal | simp-chinese-informal | japanese-informal | trad-chinese-formal | cjk-ideographic | japanese-formal | trad-chinese-informal">&lt;counter-style></a> and provides an <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/css-counter-styles-3/#at-ruledef-counter-style" id="ref-for-at-ruledef-counter-style">@counter-style</a> syntax for customized counter styles. 
     <dt><a href="https://www.w3.org/TR/css-masking-1/">CSS Masking Level 1</a> <a data-link-type="biblio" href="#biblio-css-masking-1">[CSS-MASKING-1]</a> 
     <dd> Replaces CSS2§11.1.2
				and introduces more powerful ways of clipping and masking content. 
     <dt><a href="https://www.w3.org/TR/css-shapes-1/">CSS Shapes Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-shapes-1">[CSS-SHAPES-1]</a> 
     <dd> Extends floats to effect non-rectangular wrapping shapes. 
     <dt><a href="https://www.w3.org/TR/css-text-decor-3/">CSS Text Decoration Level 3</a> <a data-link-type="biblio" href="#biblio-css-text-decor-3">[CSS-TEXT-DECOR-3]</a> 
     <dd> Replaces CSS2§16.3,
				providing more control over text decoration lines
				and adding the ability to specify text emphasis marks
				and text shadows. 
     <dt><a href="https://www.w3.org/TR/css-will-change-1/">CSS Will Change Level 1</a> <a data-link-type="biblio" href="#biblio-css-will-change-1">[CSS-WILL-CHANGE-1]</a> 
     <dd> Introduces a performance hint property called <a class="property" data-link-type="propdesc" href="https://www.w3.org/TR/css-will-change-1/#propdef-will-change" id="ref-for-propdef-will-change">will-change</a>. 
    </dl>
    <dt><a href="https://www.w3.org/TR/css3-speech/">CSS Speech Module Level 1</a> <a data-link-type="biblio" href="#biblio-css3-speech">[CSS3-SPEECH]</a> 
    <dd> Replaces CSS2§A,
				overhauling the (non-normative) speech rendering chapter. 
    <dt><a href="https://www.w3.org/TR/css-align-3/">CSS Box Alignment Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-align-3">[CSS-ALIGN-3]</a> 
    <dd> Contains the features of CSS relating to the alignment of boxes
				within their containers in the various CSS box layout models:
				block layout, table layout, flex layout, and grid layout. 
    <dt><a href="https://www.w3.org/TR/css-grid-1/">CSS Grid Layout Module Level 1</a> <a data-link-type="biblio" href="#biblio-css-grid-1">[CSS-GRID-1]</a> 
    <dd> Defines a two-dimensional grid-based layout system,
				optimized for user interface design.
				In the grid layout model, the children of a grid container
				can be positioned into arbitrary slots in a predefined flexible or fixed-size layout grid. 
    <dt><a href="https://www.w3.org/TR/filter-effects-1/">Filter Effects Module Level 1</a> <a data-link-type="biblio" href="#biblio-filter-effects-1">[FILTER-EFFECTS-1]</a> 
    <dd> Filter effects are a way of processing an element’s rendering before it is displayed in the document. 
    <dt><a href="https://www.w3.org/TR/css-break-3/">CSS Fragmentation Module Level 3</a> <a data-link-type="biblio" href="#biblio-css-break-3">[CSS-BREAK-3]</a> 
    <dd>
      Describes the fragmentation model that partitions a flow into pages, columns, or regions. 
     <p>We hope to incorporate them into a future snapshot.</p>
   </div>
   <p><strong class="advisement"> A list of all CSS modules, stable and in-progress,
	and their statuses
	can be found at the <a href="http://www.w3.org/Style/CSS/current-work">CSS Current Work page</a>.</strong></p>
   <h3 class="heading settled" data-level="2.1" id="css-levels"><span class="secno">2.1. </span><span class="content"> CSS Levels</span><a class="self-link" href="#css-levels"></a></h3>
   <p>Cascading Style Sheets does not have versions in the traditional sense;
	instead it has <dfn data-dfn-type="dfn" data-noexport id="levels">levels<a class="self-link" href="#levels"></a></dfn>. Each level of CSS builds on the previous,
	refining definitions and adding features. The feature set of each higher
	level is a superset of any lower level, and the behavior allowed for a given
	feature in a higher level is a subset of that allowed in the lower levels.
	A user agent conforming to a higher level of CSS is thus also conformant to
	all lower levels.</p>
   <dl>
    <dt><dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="css-level-1">CSS Level 1</dfn> 
    <dd> The CSS Working Group considers the <a href="https://www.w3.org/TR/2008/REC-CSS1-20080411/">CSS1 specification</a> to be
			obsolete. <a data-link-type="dfn" href="#css-level-1" id="ref-for-css-level-1">CSS Level 1</a> is defined as all the features defined
			in the CSS1 specification (properties, values, at-rules, etc), but using
			the syntax and definitions in the <a href="https://www.w3.org/TR/CSS2/">CSS2.1 specification</a>. <a href="https://www.w3.org/TR/css-style-attr/">CSS Style Attributes</a> defines its inclusion in element-specific style attributes. 
    <dt><dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="css-level-2">CSS Level 2</dfn> 
    <dd>
      Although the <a href="https://www.w3.org/TR/2008/REC-CSS2-20080411/">CSS2 specification</a> is technically a W3C Recommendation, it passed into the Recommendation stage
			before the W3C had defined the Candidate Recommendation stage. Over time
			implementation experience and further review has brought to light many problems
			in the CSS2 specification, so instead of expanding an already <a href="http://www.w3.org/Style/css2-updates/REC-CSS2-19980512-errata.html">unwieldy
			errata list</a>, the CSS Working Group chose to define <cite>CSS Level 2
			Revision 1</cite> (CSS2.1). In case of any conflict between the two specs
			CSS2.1 contains the definitive definition. 
     <p>Once CSS2.1 became Candidate Recommendation—effectively though not
			officially the same level of stability as CSS2—obsoleted the CSS2
			Recommendation.  Features in CSS2 that were dropped from CSS2.1 should be
			considered to be at the Candidate Recommendation stage, but note that many
			of these have been or will be pulled into a CSS Level 3 working draft, in
			which case that specification will, once it reaches CR, obsolete the
			definitions in CSS2.</p>
     <p>The <a href="https://www.w3.org/TR/CSS2/">CSS2.1 specification</a> defines <a data-link-type="dfn" href="#css-level-2" id="ref-for-css-level-2">CSS Level 2</a> and the <a href="https://www.w3.org/TR/css-style-attr/">CSS
			Style Attributes specification</a> defines its inclusion in
			element-specific style attributes.</p>
    <dt><dfn class="dfn-paneled" data-dfn-type="dfn" data-export id="css-level-3">CSS Level 3</dfn> 
    <dd>
      <a data-link-type="dfn" href="#css-level-3" id="ref-for-css-level-3">CSS Level 3</a> builds on CSS Level 2 module by module, using the CSS2.1
			specification as its core. Each module adds functionality and/or
			replaces part of the CSS2.1 specification. The CSS Working Group
			intends that the new CSS modules will not contradict the CSS2.1
			specification: only that they will add functionality and refine
			definitions. As each module is completed, it will be plugged in to
			the existing system of CSS2.1 plus previously-completed modules. 
     <p>From this level on modules are levelled independently: for example
			Selectors Level 4 may well be completed before CSS Line Module Level 3.
			Modules with no <a data-link-type="dfn" href="#css-level-2" id="ref-for-css-level-2①">CSS Level 2</a> equivalent start at Level 1;
			modules that update features that existed in <span id="ref-for-css-level-2②">CSS Level 2</span> start at Level 3.</p>
    <dt><dfn data-dfn-type="dfn" data-export id="css-level-4">CSS Level 4<a class="self-link" href="#css-level-4"></a></dfn> and beyond 
    <dd> There is no CSS Level 4.
			Independent modules can reach level 4 or beyond,
			but CSS the language no longer has levels.
			("CSS Level 3" as a term is used only to differentiate it from the previous monolithic versions.) 
   </dl>
   <h3 class="heading settled" data-level="2.2" id="profiles"><span class="secno">2.2. </span><span class="content"> CSS Profiles</span><a class="self-link" href="#profiles"></a></h3>
   <p>Not all implementations will implement all functionality defined in CSS.</p>
   <p>In the past, the Working Group published a few Profiles,
	which were meant to define the minimal subset of CSS
	that various classes of User Agents were expected to support.</p>
   <p>This effort has been discontinued,
	as the Working Group was not finding it effective or useful,
	and the profiles previously defined are now unmaintained.</p>
   <p class="note" role="note"><span>Note:</span> Partial implementations of CSS, even if that subset is an official profile,
	must follow the forward-compatible parsing rules for <a href="#partial">partial implementations</a>.</p>
   <h2 class="heading settled" data-level="3" id="responsible"><span class="secno">3. </span><span class="content"> Requirements for Responsible Implementation of CSS</span><a class="self-link" href="#responsible"></a></h2>
   <p>The following sections define several conformance requirements
	for implementing CSS responsibly,
	in a way that promotes interoperability in the present and future.</p>
   <h3 class="heading settled" data-level="3.1" id="partial"><span class="secno">3.1. </span><span class="content">Partial Implementations</span><a class="self-link" href="#partial"></a></h3>
   <p>So that authors can exploit the forward-compatible parsing rules to assign fallback values, <strong>CSS renderers <em>must</em> treat as invalid
	(and <a href="https://www.w3.org/TR/CSS2/conform.html#ignore">ignore as appropriate</a>)
	any at-rules, properties, property values, keywords, and other syntactic constructs
	for which they have no usable level of support</strong>.
	In particular, user agents <em>must not</em> selectively ignore
	unsupported property values and honor supported values in a single multi-value property declaration:
	if any value is considered invalid (as unsupported values must be),
	CSS requires that the entire declaration be ignored.</p>
   <h3 class="heading settled" data-level="3.2" id="future-proofing"><span class="secno">3.2. </span><span class="content">Implementations of Unstable and Proprietary Features</span><a class="self-link" href="#future-proofing"></a></h3>
   <p>To avoid clashes with future stable CSS features,
	the CSSWG recommends the following best practices for the implementation of <a data-link-type="dfn" href="#unstable" id="ref-for-unstable">unstable</a> features and <a data-link-type="dfn" href="#proprietary-extension" id="ref-for-proprietary-extension">proprietary extensions</a> to CSS:</p>
   <h4 class="heading settled" data-level="3.2.1" id="experimental"><span class="secno">3.2.1. </span><span class="content"> Experimentation and Unstable Features</span><a class="self-link" href="#experimental"></a></h4>
   <p>Implementations of <a data-link-type="dfn" href="#unstable" id="ref-for-unstable①">unstable</a> features
	that are described in W3C specifications
	but are not interoperable
	should not be released broadly for general use;
	but may be released for limited, experimental use in controlled environments.</p>
   <details class="why">
    <summary>Why?</summary>
     We want to allow both authors and implementors to experiment with the feature and give feedback,
		but prevent authors from relying on them in production websites
		and thereby accidentally "locking in" (through content dependence)
		certain syntax or behavior that might change later. 
   </details>
   <div class="example" id="example-e5f16ed9"><a class="self-link" href="#example-e5f16ed9"></a> For example,
		a UA could release an <a data-link-type="dfn" href="#unstable" id="ref-for-unstable②">unstable</a> features for experimentation
		through beta or other testing-stage builds;
		behind a hidden configuration flag;
		behind a switch enabled only for specific testing partners;
		or through some other means of limiting dependent use. </div>
   <p>A CSS feature is considered <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="unstable">unstable</dfn> until
	its specification has reached the Candidate Recommendation (CR) stage in the W3C process.
	In exceptional cases,
	the CSSWG may additionally, by an officially-recorded resolution,
	add pre-CR features to the set that are considered safe to release for broad use.</p>
   <p class="note" role="note"><span>Note:</span> Vendors should consult the WG explicitly and not make assumptions on this point,
	as a pre-CR spec that hasn’t changed in awhile is usually more out-of-date than stable.</p>
   <p>The current list of pre-CR features approved for wide release consists of:</p>
   <ul>
    <li>CSS Animations <a data-link-type="biblio" href="#biblio-css3-animations">[CSS3-ANIMATIONS]</a> 
    <li>CSS Transitions <a data-link-type="biblio" href="#biblio-css3-transitions">[CSS3-TRANSITIONS]</a> 
    <li>CSS Transforms <a data-link-type="biblio" href="#biblio-css3-transforms">[CSS3-TRANSFORMS]</a> 
    <li>The <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/css-sizing-3/#valdef-width-min-content" id="ref-for-valdef-width-min-content">min-content</a>, <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/css-sizing-3/#valdef-width-max-content" id="ref-for-valdef-width-max-content">max-content</a>, and <span class="css">fit-content</span> keywords from <a data-link-type="biblio" href="#biblio-css-sizing-3">[CSS-SIZING-3]</a> 
    <li>The <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/selectors4/#dir-pseudo" id="ref-for-dir-pseudo">:dir()</a> and <a class="css" data-link-type="maybe" href="https://www.w3.org/TR/selectors4/#lang-pseudo" id="ref-for-lang-pseudo">:lang()</a> selectors from <a data-link-type="biblio" href="#biblio-selectors4">[SELECTORS4]</a> 
   </ul>
   <h4 class="heading settled" data-level="3.2.2" id="proprietary"><span class="secno">3.2.2. </span><span class="content"> Proprietary and Non-standardized Features</span><a class="self-link" href="#proprietary"></a></h4>
   <p>To avoid clashes with future CSS features,
	the CSS2.1 specification reserves a <dfn class="dfn-paneled" data-dfn-type="dfn" data-lt="vendor prefix | vendor-prefixed | prefixed | unprefixed" data-noexport id="vendor-prefix"><a href="https://www.w3.org/TR/CSS21/syndata.html#vendor-keywords">prefixed syntax</a></dfn> <a data-link-type="biblio" href="#biblio-css2">[CSS2]</a> for proprietary and experimental extensions to CSS.
	A CSS feature is a <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="proprietary-extension">proprietary extension</dfn> if it is meant for use
	in a closed environment accessible only to a single vendor’s user agent(s).
	A UA should support such <a data-link-type="dfn" href="#proprietary-extension" id="ref-for-proprietary-extension①">proprietary extensions</a> only through a vendor-<a data-link-type="dfn" href="#vendor-prefix" id="ref-for-vendor-prefix">prefixed</a> syntax
	and not expose them to open (multi-UA) environments such as the World Wide Web.</p>
   <details class="why">
    <summary>Why?</summary>
     The prefixing requirement allows shipping specialized features in closed environments
		without conflicting with future additions to standard CSS.
		The restriction on exposure to open systems is to prevent
		accidentally causing the public CSS environment
		to depend on an unstandardized <a data-link-type="dfn" href="#proprietary-extension" id="ref-for-proprietary-extension②">proprietary extensions</a>. 
   </details>
   <div class="example" id="example-5502e5f5"><a class="self-link" href="#example-5502e5f5"></a> For example,
		Firefox’s XUL-based UI, Apple’s iTunes UI, and Microsoft’s Universal Windows Platform app
		use extensions to CSS implemented by their respective UAs.
		So long as these UAs do not allow Web content to access these features,
		they do not provide an opportunity for such content
		to become dependent on their <a data-link-type="dfn" href="#proprietary-extension" id="ref-for-proprietary-extension③">proprietary extensions</a>. </div>
   <p>Even if a feature is intended to eventually be used in the Web,
	if it hasn’t yet been standardized
	it should still not be exposed to the Web.</p>
   <h4 class="heading settled" data-level="3.2.3" id="de-facto"><span class="secno">3.2.3. </span><span class="content"> Market Pressure and De Facto Standards</span><a class="self-link" href="#de-facto"></a></h4>
   <p>If a feature is <a data-link-type="dfn" href="#unstable" id="ref-for-unstable③">unstable</a> (i.e. the spec has not stabilized yet), yet</p>
   <ul>
    <li data-md>
     <p>at least three UAs implement the feature
(<em>or</em> a UA has broken the other rules and shipped for broad use
an <a data-link-type="dfn" href="#unstable" id="ref-for-unstable④">unstable</a> or otherwise non-standard feature in a production release),</p>
    <li data-md>
     <p><em>and</em> the implementations have rough interoperability,</p>
    <li data-md>
     <p><em>and</em> the CSS Working Group has recorded consensus
that this feature should exist and be released,</p>
   </ul>
   <p>implementers may ship that feature <a data-link-type="dfn" href="#vendor-prefix" id="ref-for-vendor-prefix①">unprefixed</a> in broad-release builds. <dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="rough-interoperability">Rough interoperability</dfn> is satisfied by a subjective judgment
	that even though there may be differences,
	the implementations are sufficiently similar
	to be used in production websites for a substantial number of use cases.</p>
   <p class="note" role="note">Note that the CSSWG must still be consulted to ensure coordination across vendors
		and to ensure sanity review by the CSS experts from each vendor.
		Note also that <a data-link-type="dfn" href="#rough-interoperability" id="ref-for-rough-interoperability①">rough interoperability</a> still usually means
		painful lack of interop in edge (or not-so-edge) cases,
		particularly because details have not been ironed out through the standards review process. </p>
   <details class="why">
    <summary>Why?</summary>
     If a feature is sufficiently popular that three or more browsers have implemented it before it’s finished standardization,
		this clause allows releasing the pressure to ship.
		Also, if a feature has already escaped into the wild and sites have started depending on it,
		pretending it’s still “experimental” doesn’t help anyone.
		Allowing others to ship unprefixed recognizes that the feature is now de facto standardized
		and encourages authors to write cross-platform code. 
   </details>
   <h5 class="no-toc heading settled" data-level="3.2.3.1" id="unstable-syntax"><span class="secno">3.2.3.1. </span><span class="content"> Vendor-prefixing Unstable Features</span><a class="self-link" href="#unstable-syntax"></a></h5>
   <p>When exposing such a standards-track <a data-link-type="dfn" href="#unstable" id="ref-for-unstable⑤">unstable</a> feature to the Web in a production release,
	implementations should support <em>both</em> <a data-link-type="dfn" href="#vendor-prefix" id="ref-for-vendor-prefix②">vendor-prefixed</a> and unprefixed syntaxes
	for the feature.
	Once the feature has stabilized and the implementation is updated to match interoperable behavior,
	support for the <span id="ref-for-vendor-prefix③">vendor-prefixed</span> syntax should be removed. </p>
   <details class="why">
    <summary>Why?</summary>
     This is recommended so that authors can use the unprefixed syntax to target all implementations,
		but when necessary, can target specific implementations
		to work around incompatibilities among implementations
		as they get ironed out through the standards/bugfixing process. 
    <p>The lack of a phase
		where only the prefixed syntax is supported
		greatly reduces the risk of stylesheets
		being written with only the vendor-prefixed syntax.
		This in turn allows UA vendors to retire
		their prefixed syntax once the feature is stable,
		with a lower risk of breaking existing content.
		It also reduces the need occasionally felt by by some vendors
		to support a feature with the prefix of another vendor,
		due to content depending on that syntax.</p>
   </details>
   <p>Anyone promoting <a data-link-type="dfn" href="#unstable" id="ref-for-unstable⑥">unstable</a> features to authors
	should document them using their standard unprefixed syntax,
	and avoid encouraging the use of the <a data-link-type="dfn" href="#vendor-prefix" id="ref-for-vendor-prefix④">vendor-prefixed</a> syntax
	for any purpose other than working around implementation differences.</p>
   <h5 class="no-toc heading settled" data-level="3.2.3.2" id="open-technology"><span class="secno">3.2.3.2. </span><span class="content"> Preserving the Openness of CSS</span><a class="self-link" href="#open-technology"></a></h5>
   <p>In order to preserve the open nature of CSS as a technology,
	vendors should make it possible for other implementors
	to freely implement any features that they do ship.
	To this end, they should provide spec-editing and testing resources
	to complete standardization of such features,
	and avoid other obstacles (e.g., platform dependency, licensing restrictions)
	to their competitors shipping the feature.</p>
   <h3 class="heading settled" data-level="3.3" id="testing"><span class="secno">3.3. </span><span class="content">Implementations of CR-level Features</span><a class="self-link" href="#testing"></a></h3>
   <p>Once a specification reaches the Candidate Recommendation stage,
	implementers should release an <a data-link-type="dfn" href="#vendor-prefix" id="ref-for-vendor-prefix⑤">unprefixed</a> implementation
	of any CR-level feature they can demonstrate
	to be correctly implemented according to spec,
	and should avoid exposing a prefixed variant of that feature.</p>
   <p>To establish and maintain the interoperability of CSS across
	implementations, the CSS Working Group requests that non-experimental
	CSS renderers submit an implementation report (and, if necessary, the
	testcases used for that implementation report) to the W3C before
	releasing an unprefixed implementation of any CSS features. Testcases
	submitted to W3C are subject to review and correction by the CSS
	Working Group.</p>
   <p>Further information on submitting testcases and implementation reports
	can be found from on the CSS Working Group’s website at <a href="http://www.w3.org/Style/CSS/Test/">http://www.w3.org/Style/CSS/Test/</a>.
	Questions should be directed to the <a href="http://lists.w3.org/Archives/Public/public-css-testsuite">public-css-testsuite@w3.org</a> mailing list.</p>
   <h2 class="heading settled" data-level="4" id="indices"><span class="secno">4. </span><span class="content">Indices</span><a class="self-link" href="#indices"></a></h2>
   <p><em>These sections are non-normative.</em></p>
   <h3 class="heading settled" data-level="4.1" id="terms"><span class="secno">4.1. </span><span class="content">Terms Index</span><a class="self-link" href="#terms"></a></h3>
   <div data-link-spec="
	css2,
	css-syntax-3,
	css-style-attr-1,
	mediaqueries-3,
	css-conditional-3,
	css-namespaces-3,
	selectors-3,
	css-cascade-3,
	css-values-3,
	css-color-3,
	css-backgrounds-3,
	css-images-3,
	css-fonts-3,
	css-multicol-1,
	css-ui-3,
	compositing-1,
	css-writing-modes-3,
	css-transitions-1,
	css-animations-1,
	css-flexbox-1,
	css-transforms-1,
	css-variables-1,
	css-text-3,
	css-counter-styles-3,
	css-masking-1,
	css-shapes-1,
	css-text-decor-3,
	css-will-change-1,
	css-speech-1,
	css-align-3,
	css-grid-1,
	filter-effects-1,
	css-break-3" data-link-status="TR">
    <ul class="index">
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-weight-numeric-values">100...900 weight values</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-offset-x">1st &lt;length></a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#2d-matrix">2d matrix</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-offset-y">2nd &lt;length></a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-blur-radius">3rd &lt;length></a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-spread-distance">4th &lt;length></a>
     <li><a href="https://www.w3.org/TR/css-syntax-3/#a">a</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#absolute-length">absolute length</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#absolutely-positioned">absolutely positioned element</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#abstract-dimensions">abstract dimensions</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#activeborder">activeborder</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#activecaption">activecaption</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#active-duration">active duration</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#actual-value">actual value</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#additive-tuple">additive tuple</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#x28">adjoining</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#length-advance-measure">advance measure</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#after-change-style">after-change style</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#aliceblue">aliceblue</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#alignment-baseline">alignment baseline</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#alignment-container">alignment container</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#shared-alignment-context">alignment context</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#alignment-subject">alignment subject</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#all-petite-caps">all-petite-caps</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#all-small-caps">all-small-caps</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#alphabetic-baseline">alphabetic baseline</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#anb">an+b</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#anchor-unit">anchor</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#anchor-unit">anchor unit</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade-origin-animation">animation origin</a>
     <li><a href="https://drafts.csswg.org/css-variables-1/#animation-tainted">animation-tainted</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#antiquewhite">antiquewhite</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#appworkspace">appworkspace</a>
     <li>
      aqua
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#aqua">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#aqua0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#aquamarine">aquamarine</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-two-code-points-are-a-valid-escape">are a valid escape</a>
     <li><a href="https://www.w3.org/TR/css-syntax-3/#ascii-case-insensitive">ascii case-insensitive</a>
     <li>
      as conformance class
      <ul>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#style-sheet">in css-fonts-3</a>
       <li><a href="https://www.w3.org/TR/css3-images/#style-sheet">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-speech-1/#style-sheet0">in css-speech-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#aspect-value">aspect value</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x13">atomic inline-level boxes</a>
     <li>
      at-rule
      <ul>
       <li><a href="https://www.w3.org/TR/css-syntax-3/#at-rule">in css-syntax-3</a>
       <li><a href="https://drafts.csswg.org/css-syntax-3/#at-rule">in css-syntax-3, for CSS</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-grid-1/#augmented-grid">augmented grid</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#aural-box-model">aural "box" model</a>
     <li>
      authoring tool
      <ul>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#authoring-tool">in css-fonts-3</a>
       <li><a href="https://www.w3.org/TR/css3-images/#authoring-tool">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-speech-1/#authoring-tool">in css-speech-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade-origin-author">author origin</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade-origin-author">author style sheet</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-auto-value">auto!!font-kerning</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#automatic-grid-position">automatic column position</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#automatic-grid-position">automatic grid position</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#auto-placement">automatic placement</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#automatic-grid-position">automatic position</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#automatic-grid-position">automatic row position</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#auto-placement">auto-placement</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#auto-placement-cursor">auto-placement cursor</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#available-grid-space">available grid space</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#avoid-break-values">avoid break values</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#azure">azure</a>
     <li><a href="https://www.w3.org/TR/css-syntax-3/#b">b</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#backdrop">backdrop</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#background">background</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#background-painting-area">background painting area</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#background-positioning-area">background positioning area</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#baseline">baseline</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#baseline-alignment">baseline alignment</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#baseline-alignment-preference">baseline alignment preference</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#baseline-content-alignment">baseline content-alignment</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#baseline-self-alignment">baseline self-alignment</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#baseline-set">baseline set</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#baseline-sharing-group">baseline-sharing group</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#baseline-table">baseline table</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#base-size">base size</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#bearing-angle">bearing angle</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#before-change-style">before-change style</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#beige">beige</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#bidi-formatting-characters">bidi formatting characters</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#bidi-isolate">bidi-isolate</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#bidi-isolate">bidi-isolated</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#bidi-isolate">bidi isolation</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#bidi-paragraph">bidi paragraph</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#bidirectionality">bidirectionality</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#bi-orientational">bi-orientational</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#bi-orientational-transform">bi-orientational transform</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#bisque">bisque</a>
     <li>
      black
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#black">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#black0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#blanchedalmond">blanchedalmond</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#block-axis">block axis</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#block-axis">block-axis</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x8">block boxes</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#block-container-box">block container box</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#block-dimension">block dimension</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#block-end">block end</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#block-end">block-end</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#block-flow-direction">block flow direction</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x5">block-level boxes</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#block-level">block-level elements</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#block-scripts">block scripts</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#block-size">block size</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#block-size">block-size</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#block-start">block start</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#block-start">block-start</a>
     <li>
      blue
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#blue">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#blue0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#blueviolet">blueviolet</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#blur-radius">blur radius</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#bold">bold</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#bolder">bolder</a>
     <li>
      border
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#border-def">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#box-border-area">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css2/box.html#x14">border box</a>
     <li><a href="https://www.w3.org/TR/css-shapes-1/#border-box">border-box</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#border-image-area">border image area</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#border-radii">border radius</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical-bottom">bottom</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#box-alignment-properties">box alignment properties</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#box-corner">box-corner</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#box-fragment">box fragment</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#break">break</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#brown">brown</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#burlywood">burlywood</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#buttonface">buttonface</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#buttonhighlight">buttonhighlight</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#buttonshadow">buttonshadow</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#buttontext">buttontext</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#cadetblue">cadetblue</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#transition-cancel">cancel</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#canonical-unit">canonical unit</a>
     <li><a href="https://drafts.csswg.org/css2/intro.html#canvas">canvas</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#captiontext">captiontext</a>
     <li>
      cascade
      <ul>
       <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade">in css-cascade-3</a>
       <li><a href="https://drafts.csswg.org/css-speech-1/#cascade-def">in css-speech-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascaded-value">cascaded value</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#origin">cascade origin</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#central-baseline">central baseline</a>
     <li>
      character
      <ul>
       <li><a href="https://drafts.csswg.org/css-text-3/#character">in css-text-3</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#character">in css-text-decor-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#character-map">character map</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#chartreuse">chartreuse</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-an-identifier">check if three code points would start an identifier</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-a-number">check if three code points would start a number</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-two-code-points-are-a-valid-escape">check if two code points are a valid escape</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#child-combinator">child combinator</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#writing-system-chinese">chinese</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#chocolate">chocolate</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#circled-lower-latin">circled-lower-latin</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#clamp-a-grid-area">clamp a grid area</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#clearance">clearance.</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#clipping-path">clipping path</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#clipping-region">clipping region</a>
     <li><a href="https://drafts.csswg.org/css-shapes-1/#closest-side">closest-side</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#clustered-scripts">clustered scripts</a>
     <li><a href="https://www.w3.org/TR/css-syntax-3/#code-point">code point</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#x26">collapse</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#collapsed-flex-item">collapsed flex item</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#collapsed-gutter">collapsed gutter</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#x27">collapsed margin</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#collapsed-track">collapsed track</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#x29">collapse through</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#collapsible-white-space">collapsible</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#collapsible-white-space">collapsible white space</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#color-stop">color stop</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#color-stop-list">color stop list</a>
     <li><a href="https://www.w3.org/TR/css-grid-1/#column-axis">column axis</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#column-box">column box</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#column-break">column break</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#column-gap">column gap</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#column-height">column height</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#column-row">column row</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#column-rule">column rule</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#column-width">column width</a>
     <li>
      combinators
      <ul>
       <li><a href="https://drafts.csswg.org/css2/selector.html#combinator">in css2</a>
       <li><a href="https://drafts.csswg.org/selectors-3/#combinators0">in selectors-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#transition-combined-duration">combined duration</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#common-ligatures">common-ligatures</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#compatible-baseline-alignment-preferences">compatible baseline alignment preferences</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#compatible-units">compatible units</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#dfn-complete">complete</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#completed-transition">completed transition</a>
     <li>
      component value
      <ul>
       <li><a href="https://www.w3.org/TR/css-syntax-3/#component-value">in css-syntax-3</a>
       <li><a href="https://drafts.csswg.org/css-syntax-3/#component-value">in css-syntax-3, for CSS</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#composite-face">composite face</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#computed-track-list">computed track list</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#computed-value">computed value</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#concrete-object-size">concrete object size</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#condensed">condensed</a>
     <li><a href="https://drafts.csswg.org/css-conditional-3/#conditional-group-rule">conditional group rule</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#conditional-group-rules">conditional group rules</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#conform-authoring-tool">conformance::authoring tool</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#conform-processor">conformance::processor</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#conform-style-sheet">conformance::style sheet</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#constraint-rectangle">constraint rectangle</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-component-value">consume a component value</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-declaration">consume a declaration</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-function">consume a function</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-list-of-declarations">consume a list of declarations</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-list-of-rules">consume a list of rules</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-name">consume a name</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-an-at-rule">consume an at-rule</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-an-escaped-code-point">consume an escaped code point</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-an-ident-like-token">consume an ident-like token</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-number">consume a number</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-numeric-token">consume a numeric token</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-qualified-rule">consume a qualified rule</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-simple-block">consume a simple block</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-string-token">consume a string token</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-token">consume a token</a>
     <li><a href="https://www.w3.org/TR/css-syntax-3/#consume-a-unicode-range-token0">consume a unicode-range token</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-a-url-token">consume a url token</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-comments">consume comments</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-the-next-input-token">consume the next input token</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#consume-the-remnants-of-a-bad-url">consume the remnants of a bad url</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#contain-constraint">contain constraint</a>
     <li>
      containing block
      <ul>
       <li><a href="https://drafts.csswg.org/css2/visuren.html#x3">in css2</a>
       <li><a href="https://drafts.csswg.org/css2/visudet.html#x0">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#containing-block-for-all-descendants">containing block for all descendants</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#content-def">content</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#box-content-area">content area</a>
     <li>
      content-based minimum size
      <ul>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#content-based-minimum-size">in css-flexbox-1</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#content-based-minimum-size">in css-grid-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css2/box.html#x10">content box</a>
     <li><a href="https://www.w3.org/TR/css-shapes-1/#content-box">content-box</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#content-distribution">content-distribution</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#content-distribution-properties">content-distribution properties</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#content-height">content height</a>
     <li>
      content language
      <ul>
       <li><a href="https://drafts.csswg.org/css-text-3/#content-language">in css-text-3</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#content-language">in css-text-decor-3</a>
      </ul>
     <li>
      content size suggestion
      <ul>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#content-size-suggestion">in css-flexbox-1</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#content-size-suggestion">in css-grid-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css2/box.html#content-width">content width</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#content-writing-system">content writing system</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#contextual">contextual</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#convert-a-string-to-a-number">convert a string to a number</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#coordinated-self-alignment-preference">coordinated self-alignment preference</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#coral">coral</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#cornflowerblue">cornflowerblue</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#cornsilk">cornsilk</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#counter-style">counter style</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#counter-symbol">counter symbol</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#cover-constraint">cover constraint</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#crimson">crimson</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-axis">cross axis</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-axis">cross-axis</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-axis-baseline">cross-axis baseline set</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-dimension">cross dimension</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-end">cross-end</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-size">cross size</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-size">cross-size</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-size-property">cross size property</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-start">cross-start</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#CSS-interface">css</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#css-bracketed-range-notation">css bracketed range notation</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#cssconditionrule">cssconditionrule</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#cssfontfacerule">cssfontfacerule</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#cssgroupingrule">cssgroupingrule</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#css-identifier">css ident</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#css-identifier">css identifier</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#cssmediarule">cssmediarule</a>
     <li><a href="https://drafts.csswg.org/css-namespaces-3/#css-qualified-name">css qualified name</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#csssupportsrule">csssupportsrule</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#css-wide-keywords">css-wide keywords</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#currentColor-def">currentcolor</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#current-input-code-point">current input code point</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#current-input-token">current input token</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#current-transformation-matrix">current transformation matrix</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#current-tuple">current tuple</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#current-value">current value</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#cursive">cursive</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#cursive-script">cursive script</a>
     <li><a href="https://drafts.csswg.org/css-variables-1/#custom-property">custom property</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#cyan">cyan</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkblue">darkblue</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkcyan">darkcyan</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkgoldenrod">darkgoldenrod</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkgray">darkgray</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkgreen">darkgreen</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkgrey">darkgrey</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkkhaki">darkkhaki</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkmagenta">darkmagenta</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkolivegreen">darkolivegreen</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkorange">darkorange</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkorchid">darkorchid</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkred">darkred</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darksalmon">darksalmon</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkseagreen">darkseagreen</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkslateblue">darkslateblue</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkslategray">darkslategray</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkslategrey">darkslategrey</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkturquoise">darkturquoise</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#darkviolet">darkviolet</a>
     <li>
      declaration
      <ul>
       <li><a href="https://www.w3.org/TR/css-syntax-3/#declaration">in css-syntax-3</a>
       <li><a href="https://drafts.csswg.org/css-syntax-3/#declaration">in css-syntax-3, for CSS</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css2/syndata.html#x14">declaration block</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#declared">declared</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#declared-value">declared value</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#decode">decode</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#decorating-box">decorating box</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#deeppink">deeppink</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#deepskyblue">deepskyblue</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#default-face">default face</a>
     <li><a href="https://drafts.csswg.org/css-namespaces-3/#default-namespace">default namespace</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#default-object-size">default object size</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#default-sizing-algorithm">default sizing algorithm</a>
     <li><a href="https://drafts.csswg.org/css2/cascade.html#default-style-sheet">default style sheet</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#definite">definite</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-position">definite column position</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-span">definite column span</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-position">definite grid position</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-span">definite grid span</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-position">definite position</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-position">definite row position</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-span">definite row span</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#definite">definite size</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#definite-grid-span">definite span</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#descriptor_declaration">descriptor_declaration</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#destination">destination</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#determine-the-fallback-encoding">determine the fallback encoding</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#diagonal-fractions">diagonal-fractions</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#dice">dice</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#digit">digit</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#dimension">dimension</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#dimgray">dimgray</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#dimgrey">dimgrey</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#directional-embedding">directional embedding</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#directional-override">directional override</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#discretionary-ligatures">discretionary-ligatures</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#display-def">display</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#distributed-alignment">distributed alignment</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#distribute-extra-space">distribute extra space</a>
     <li>
      document
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#document">in css-backgrounds-3</a>
       <li><a href="https://drafts.csswg.org/css-speech-1/#document">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css-style-attr-1/#document">in css-style-attr-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-speech-1/#document">documents</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#white-space">document white space</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#white-space">document white space characters</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#dodgerblue">dodgerblue</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#dominant-baseline">dominant baseline</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#unicode-east-asian-width">east asian width property</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#effective-character-map">effective character map</a>
     <li><a href="https://drafts.csswg.org/css-shapes-1/#empty-float-area">empty float area</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#end">end</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#ending-point">ending point</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#ending-shape">ending shape</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#ending-token">ending token</a>
     <li><a href="https://www.w3.org/TR/css-syntax-3/#unicode-range-end">end of the range</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#transition-end-time">end time</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#transition-end-value">end value</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#environment-encoding">environment encoding</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#eof-code-point">eof code point</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#escape-codepoint">escaping</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#establish-an-orthogonal-flow">establish an orthogonal flow</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#expanded">expanded</a>
     <li><a href="https://drafts.csswg.org/css-namespaces-3/#expanded-name">expanded name</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#explicit-grid">explicit grid</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#explicit-grid-properties">explicit grid properties</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#extra-condensed">extra-condensed</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#extra-expanded">extra-expanded</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#fallback-alignment">fallback alignment</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#fantasy">fantasy</a>
     <li><a href="https://drafts.csswg.org/css-shapes-1/#farthest-side">farthest-side</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#filter-primitive">filter primitive</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#filter-primitive-attributes">filter primitive attributes</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#filter-primitive-subregion">filter primitive subregion</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#filter-primitive-tree">filter primitive tree</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#filter-region">filter region</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#firebrick">firebrick</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#first-available-font">first available font</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#first-baseline-alignment">first-baseline alignment</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#baseline-content-alignment">first-baseline content-alignment</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#first-baseline-set">first baselines</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#baseline-self-alignment">first-baseline self-alignment</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#first-baseline-set">first baseline set</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-axis-baseline">first cross-axis baseline set</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#first-formatted-line0">first formatted line</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-axis-baseline">first main-axis baseline set</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#first-symbol-value">first symbol value</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#fixed-sizing-function">fixed sizing function</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-base-size">flex base size</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-flex-basis">flex basis</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-container">flex container</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-direction">flex direction</a>
     <li>
      flex factor
      <ul>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-factor">in css-flexbox-1</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-columns-flex-factor">in css-grid-1, for grid-template-columns, grid-template-rows</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-grid-1/#flex-factor-sum">flex factor sum</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-formatting-context">flex formatting context</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#flex-fraction">flex fraction</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-flex-grow-factor">flex grow factor</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flexible">flexible</a>
     <li>
      flexible length
      <ul>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#flexible-length">in css-flexbox-1</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#flexible-length">in css-grid-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-grid-1/#flexible-sizing-function">flexible sizing function</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#flexible-tracks">flexible tracks</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-item">flex item</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-layout">flex layout</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-level">flex-level</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-line">flex line</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#flex-flex-shrink-factor">flex shrink factor</a>
     <li><a href="https://drafts.csswg.org/css-shapes-1/#float-area">float area</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#floralwhite">floralwhite</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x25">flow of an element</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#flow-relative">flow-relative</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#flow-relative-direction">flow-relative direction</a>
     <li><a href="https://drafts.csswg.org/css2/ui.html#x8">focus</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font_face_rule">font_face_rule</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font_face_sym">font_face_sym</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#font-family-def">font-family</a>
     <li>
      font-kerning
      <ul>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-auto-value">in css-fonts-3</a>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-none-value">in css-fonts-3</a>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-normal-value">in css-fonts-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-values-3/#font-relative-length">font-relative lengths</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-size-adjust-none-value">font-size-adjust</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-stretch-normal-value">font-stretch</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-style-normal-value">font-style</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-caps-normal-value">font-variant-caps</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-east-asian-normal-value">font-variant-east-asian</a>
     <li>
      font-variant-ligatures
      <ul>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-ligatures-none-value">in css-fonts-3</a>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-ligatures-normal-value">in css-fonts-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-numeric-normal-value">font-variant-numeric</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-position-normal-value">font-variant-position</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-weight-normal-value">font-weight</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#footnote">footnote</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#forced-break">forced break</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#forced-break-values">forced break values</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#forced-line-break">forced line break</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#forced-paragraph-break">forced paragraph break</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#forestgreen">forestgreen</a>
     <li><a href="https://drafts.csswg.org/css2/intro.html#formatting-structure">formatting structure</a>
     <li><a href="https://drafts.csswg.org/css2/syndata.html#x0">forward-compatible parsing</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#fragment">fragment</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#fragmentainer">fragmentainer</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#fragmentation">fragmentation</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#fragmentation-break">fragmentation break</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#fragmentation-container">fragmentation container</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#fragmentation-context">fragmentation context</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#fragmentation-direction">fragmentation direction</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#fragmentation-root">fragmentation root</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#fragmented-flow">fragmented flow</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#free-space">free space</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#frequency-def">frequency</a>
     <li>
      fuchsia
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#fuchsia">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#fuchsia0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-3/#kana-full-size">full-size</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#kana-full-size">full-size kana</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#full-width">full-width</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#fully-inflexible">fully inflexible</a>
     <li>
      function
      <ul>
       <li><a href="https://www.w3.org/TR/css-syntax-3/#function">in css-syntax-3</a>
       <li><a href="https://drafts.csswg.org/css-syntax-3/#function">in css-syntax-3, for CSS</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-values-3/#functional-notation">functional notation</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#gainsboro">gainsboro</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#unicode-general-category">general category</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#general_enclosed">general_enclosed</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#generate-a-counter">generate a counter</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#generate-a-counter">generate a counter representation</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#generate-baselines">generate baselines</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#get-an-encoding">get an encoding</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#ghostwhite">ghostwhite</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#go">go</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#gold">gold</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#goldenrod">goldenrod</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#gradient-average-color">gradient-average-color</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#gradient-box">gradient box</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#radial-gradient-gradient-center">gradient center</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#gradient-line">gradient line</a>
     <li><a href="https://www.w3.org/TR/css3-images/#gradient-ray">gradient ray</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#grapheme-cluster">grapheme cluster</a>
     <li>
      gray
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#gray">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#gray0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#graytext">graytext</a>
     <li>
      green
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#green">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#green0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#greenyellow">greenyellow</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#grey">grey</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid">grid</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-area">grid area</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-cell">grid cell</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-column">grid column</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-line">grid column line</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-container">grid container</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-formatting-context">grid formatting context</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-item">grid item</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-item-placement-algorithm">grid item placement algorithm</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-layout">grid layout</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-level">grid-level</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-line">grid line</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-order">grid-modified document order</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-order">grid order</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement">grid placement</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement-property">grid-placement property</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-position">grid position</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-row">grid row</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-line">grid row line</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-sizing-algorithm">grid sizing algorithm</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-span">grid span</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-track">grid track</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#group-rule-body">group rule body</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#group_rule_body">group_rule_body</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#growth-limit">growth limit</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#gutter">gutter</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#hang">hang</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#height">height</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#hex-digit">hex digit</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#highlight">highlight</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#highlighttext">highlighttext</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#historical-ligatures">historical-ligatures</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#honeydew">honeydew</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#x-axis">horizontal axis</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#horizontal-block-flow">horizontal block flow</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#horizontal-dimension">horizontal dimension</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#horizontal-offset">horizontal offset</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#horizontal-only">horizontal-only</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#horizontal-script">horizontal script</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#horizontal-writing-mode">horizontal writing mode</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#hotpink">hotpink</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#hyphenate">hyphenate</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#hyphenate">hyphenation</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#hyphenation-opportunity">hyphenation opportunity</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#hypothetical-cross-size">hypothetical cross size</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#hypothetical-fr-size">hypothetical fr size</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#hypothetical-main-size">hypothetical main size</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#css-identifier">ident</a>
     <li>
      identifier
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#identifier-def">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css-syntax-3/#identifier">in css-syntax-3</a>
       <li><a href="https://drafts.csswg.org/css-values-3/#css-identifier">in css-values-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css2/syndata.html#value-def-identifier">identifiers</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#identity-transform-function">identity transform function</a>
     <li><a href="https://drafts.csswg.org/css2/syndata.html#ignore">ignore</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#css-ignored">ignored</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid">implicit grid</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid-track">implicit grid column</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid-lines">implicit grid lines</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid-properties">implicit grid properties</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid-track">implicit grid row</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#implicit-grid-track">implicit grid track</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#implicit-named-area">implicit named area</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#implicit-named-line">implicit named line</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#bang-important">!important</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#important">important</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#import-conditions">import conditions</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#inactiveborder">inactiveborder</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#inactivecaption">inactivecaption</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#inactivecaptiontext">inactivecaptiontext</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#definite">indefinite</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#definite">indefinite size</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#indianred">indianred</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#indigo">indigo</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#infinitely-growable">infinitely growable</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x24">in-flow</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#infobackground">infobackground</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#infotext">infotext</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#inheritance">inherit</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#inheritance">inheritance</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#inherited-property">inherited property</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#inherited-value">inherited value</a>
     <li><a href="https://drafts.csswg.org/css2/visudet.html#x1">initial containing block</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#initial-free-space">initial free space</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#initial-representation-for-the-counter-value">initial representation for the counter value</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#initial-value">initial value</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#inline-axis">inline axis</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#inline-axis">inline-axis</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#inline-base-direction">inline base direction</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#inline-box">inline box</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#inline-dimension">inline dimension</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#inline-end">inline end</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#inline-end">inline-end</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x11">inline-level boxes</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#inline-level">inline-level elements</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#inline-size">inline size</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#inline-size">inline-size</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#inline-start">inline start</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#inline-start">inline-start</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#inner-box-shadow">inner box-shadow</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#input-stream">input stream</a>
     <li>
      integer
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#integer-def">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css-values-3/#integer">in css-values-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css2/tables.html#internal-table-element">internal table element</a>
     <li>
      interpreter
      <ul>
       <li><a href="https://www.w3.org/TR/css-namespaces-3/#interpreter">in css-namespaces-3</a>
       <li><a href="https://drafts.csswg.org/css-style-attr-1/#interpreter">in css-style-attr-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-images-3/#intrinsic-aspect-ratio">intrinsic aspect ratio</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#intrinsic-dimensions">intrinsic dimensions</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#intrinsic-height">intrinsic height</a>
     <li><a href="https://www.w3.org/TR/css3-images/#intrinsic-resolution">intrinsic resolution</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#intrinsic-sizing-function">intrinsic sizing function</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#intrinsic-width">intrinsic width</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#css-invalid">invalid</a>
     <li><a href="https://drafts.csswg.org/css-variables-1/#invalid-at-computed-value-time">invalid at computed-value time</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#invalid-image">invalid image</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#isolated-sequence">isolated sequence</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#bidi-isolate">isolation</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#italic">italic</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#ivory">ivory</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#writing-system-japanese">japanese</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#jis04">jis04</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#jis78">jis78</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#jis83">jis83</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#jis90">jis90</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#justification-opportunity">justification opportunity</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#khaki">khaki</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#writing-system-known">known</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#writing-system-korean">korean</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#last-baseline-alignment">last-baseline alignment</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#baseline-content-alignment">last-baseline content-alignment</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#last-baseline-set">last baselines</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#baseline-self-alignment">last-baseline self-alignment</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#last-baseline-set">last baseline set</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#cross-axis-baseline">last cross-axis baseline set</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-axis-baseline">last main-axis baseline set</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lavender">lavender</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lavenderblush">lavenderblush</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lawngreen">lawngreen</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical-left">left</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#leftover-space">leftover space</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lemonchiffon">lemonchiffon</a>
     <li><a href="https://www.w3.org/TR/css3-images/#radial-size-ellipse">[&lt;length> | &lt;percentage>]{2}</a>
     <li>
      letter
      <ul>
       <li><a href="https://drafts.csswg.org/css-syntax-3/#letter">in css-syntax-3</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#letter">in css-text-3</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#letter">in css-text-decor-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightblue">lightblue</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightcoral">lightcoral</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightcyan">lightcyan</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#lighter">lighter</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightgoldenrodyellow">lightgoldenrodyellow</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightgray">lightgray</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightgreen">lightgreen</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightgrey">lightgrey</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightpink">lightpink</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightsalmon">lightsalmon</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightseagreen">lightseagreen</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightskyblue">lightskyblue</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightslategray">lightslategray</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightslategrey">lightslategrey</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#light-source">light source</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightsteelblue">lightsteelblue</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#lightyellow">lightyellow</a>
     <li>
      lime
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#lime">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#lime0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#limegreen">limegreen</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#limited-contribution">limited max-content contribution</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#limited-contribution">limited min-content contribution</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#line-box">line box</a>
     <li>
      line break
      <ul>
       <li><a href="https://drafts.csswg.org/css-break-3/#line-break">in css-break-3</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#line-break">in css-text-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-3/#line-breaking-process">line breaking</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#line-breaking-process">line breaking process</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#line-left">line-left</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#linen">linen</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#line-name-set">line name set</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#line-orientation">line orientation</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#line-over">line-over</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#line-relative">line-relative</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#line-relative-direction">line-relative direction</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#line-right">line-right</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#line-under">line-under</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#lining-nums">lining-nums</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#x30">list properties</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#list-style-image-def">list-style-image</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#list-style-type-def">list-style-type</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#local-coordinate-system">local coordinate system</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#url-local-url-flag">local url flag</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#logical-height">logical height</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#logical-width">logical width</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#longhand">longhand</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#longhand">longhand property</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#lowercase-letter">lowercase letter</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#magenta">magenta</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-axis">main axis</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-axis">main-axis</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-axis-baseline">main-axis baseline set</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-dimension">main dimension</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-end">main-end</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-size">main size</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-size">main-size</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-size-property">main size property</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#main-start">main-start</a>
     <li>
      margin
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#margin-def">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#box-margin-area">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css2/box.html#x17">margin box</a>
     <li><a href="https://www.w3.org/TR/css-shapes-1/#margin-box">margin-box</a>
     <li>
      maroon
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#maroon">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#maroon0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#mask-border-image">mask border image</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#mask-border-image-area">mask border image area</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#mask-image">mask image</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#mask-layer-image">mask layer image</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#mask-painting-area">mask painting area</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#mask-position">mask-position</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#mask-positioning-area">mask positioning area</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#mask-size">mask-size</a>
     <li><a href="https://drafts.csswg.org/css2/selector.html#x1">matches</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#matching-transition-delay">matching transition delay</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#matching-transition-duration">matching transition duration</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#matching-transition-property-value">matching transition-property value</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#matching-transition-timing-function">matching transition timing function</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#max-cross-size">max cross size</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#max-cross-size-property">max cross size property</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#maximum-allowed-code-point">maximum allowed code point</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#max-inner-height">max inner height</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#max-inner-width">max inner width</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#max-main-size">max main size</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#max-main-size-property">max main size property</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#max-track-sizing-function">max track sizing function</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#media">media</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#atmedia-rule">'@media' rule</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mediumaquamarine">mediumaquamarine</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mediumblue">mediumblue</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mediumorchid">mediumorchid</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mediumpurple">mediumpurple</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mediumseagreen">mediumseagreen</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mediumslateblue">mediumslateblue</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mediumspringgreen">mediumspringgreen</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mediumturquoise">mediumturquoise</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mediumvioletred">mediumvioletred</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#menu">menu</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#menutext">menutext</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#midnightblue">midnightblue</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#min-cross-size">min cross size</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#min-cross-size-property">min cross size property</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#min-size-contribution">minimum contribution</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#min-inner-height">min inner height</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#min-inner-width">min inner width</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#min-main-size">min main size</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#min-main-size-property">min main size property</a>
     <li><a href="https://www.w3.org/TR/css-grid-1/#min-size-contribution">min-size contribution</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mintcream">mintcream</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#min-track-sizing-function">min track sizing function</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#mistyrose">mistyrose</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#moccasin">moccasin</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#monolithic">monolithic</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#monospace">monospace</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#multi-column-container">multicol container</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#multi-column-container">multi-column container</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#multi-column-layout">multi-column layout</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#multi-line-flex-container">multi-line flex container</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#multiply">multiply</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#name-code-point">name code point</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-areas-named-cell-token">named cell token</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#named-grid-area">named grid area</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#named-line">named line</a>
     <li><a href="https://drafts.csswg.org/css-namespaces-3/#namespace-prefix">namespace prefix</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#name-start-code-point">name-start code point</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#navajowhite">navajowhite</a>
     <li>
      navy
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#navy">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#navy0">in css-color-3</a>
      </ul>
     <li><a href="https://www.w3.org/TR/css3-conditional/#nested_statement">nested_statement</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#newline">newline</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#next-input-code-point">next input code point</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#next-input-token">next input token</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#next-sibling-combinator">next-sibling combinator</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#no-common-ligatures">no-common-ligatures</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#no-contextual">no-contextual</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#no-discretionary-ligatures">no-discretionary-ligatures</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#no-historical-ligatures">no-historical-ligatures</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#non-ascii-code-point">non-ascii code point</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-none-value">none!!font-kerning</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-size-adjust-none-value">none!!font-size-adjust</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-ligatures-none-value">none!!font-variant-ligatures</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#non-negative-number-def">non-negative-number</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#non-printable-code-point">non-printable code point</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-kerning-normal-value">normal!!font-kerning</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-stretch-normal-value">normal!!font-stretch</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-style-normal-value">normal!!font-style</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-caps-normal-value">normal!!font-variant-caps</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-east-asian-normal-value">normal!!font-variant-east-asian</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-ligatures-normal-value">normal!!font-variant-ligatures</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-numeric-normal-value">normal!!font-variant-numeric</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-position-normal-value">normal!!font-variant-position</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-weight-normal-value">normal!!font-weight</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-areas-null-cell-token">null cell token</a>
     <li>
      number
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#number-def">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css-values-3/#number">in css-values-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-values-3/#numeric-data-types">numeric data types</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#objects">objects</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#object-size-negotiation">object size negotiation</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#oblique">oblique</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#occupied">occupied</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#oldlace">oldlace</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#oldstyle-nums">oldstyle-nums</a>
     <li>
      olive
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#olive">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#olive0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#olivedrab">olivedrab</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#operating-coordinate-space">operating coordinate space</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#or">or</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#orange">orange</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#orangered">orangered</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#orchid">orchid</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#order-modified-document-order">order-modified document order</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#ordinal">ordinal</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#establish-an-orthogonal-flow">orthogonal</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#establish-an-orthogonal-flow">orthogonal flow</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#outer-box-shadow">outer box-shadow</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x23">out of flow</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#output-of-the-cascade">output of the cascade</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#over">over</a>
     <li><a href="https://drafts.csswg.org/css2/visufx.html#x0">overflow</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#overflow-alignment">overflow alignment</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#overflow-columns">overflow columns</a>
     <li>
      padding
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#padding-def">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#box-padding-area">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css2/box.html#x12">padding box</a>
     <li><a href="https://www.w3.org/TR/css-shapes-1/#padding-box">padding-box</a>
     <li><a href="https://drafts.csswg.org/css2/page.html#page-area">page area</a>
     <li><a href="https://drafts.csswg.org/css2/page.html#x1">page box</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#page-break">page break</a>
     <li><a href="https://drafts.csswg.org/css2/page.html#page-context">page context</a>
     <li><a href="https://drafts.csswg.org/css2/page.html#x5">page selector</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#pagination">pagination</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#palegoldenrod">palegoldenrod</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#palegreen">palegreen</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#paleturquoise">paleturquoise</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#palevioletred">palevioletred</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#papayawhip">papayawhip</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#css-parse-something-according-to-a-css-grammar">parse</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-comma-separated-list-of-component-values">parse a comma-separated list of component values</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-component-value">parse a component value</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-css-stylesheet">parse a css stylesheet</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-declaration">parse a declaration</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-list-of-component-values">parse a list of component values</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-list-of-declarations">parse a list of declarations</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-list-of-rules">parse a list of rules</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-rule">parse a rule</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#parse-a-stylesheet">parse a stylesheet</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#parse-error">parse error</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#css-parse-something-according-to-a-css-grammar">parse something according to a css grammar</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#baseline-participation">participates in baseline alignment</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#pass-through-filter">pass through filter</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#peachpuff">peachpuff</a>
     <li><a href="https://drafts.csswg.org/css-variables-1/#pending-substitution-value">pending-substitution value</a>
     <li>
      percentage
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#percentage-def">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css-values-3/#percentage">in css-values-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#peru">peru</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#petite-caps">petite-caps</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical">physical</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical-bottom">physical bottom</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical-dimensions">physical dimensions</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical-direction">physical direction</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical-left">physical left</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical-right">physical right</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical-top">physical top</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#physical-units">physical units</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#pink">pink</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#plum">plum</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#positional-alignment">positional alignment</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#positioned-element">positioned</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x22">positioning schemes:</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#post-multiplied">post-multiplied</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#post-multiply">post-multiply</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#powderblue">powderblue</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#pre-multiplied">pre-multiplied</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#pre-multiply">pre-multiply</a>
     <li><a href="https://www.w3.org/TR/css-text-3/#preserved">preserved</a>
     <li>
      preserved tokens
      <ul>
       <li><a href="https://www.w3.org/TR/css-syntax-3/#preserved-tokens">in css-syntax-3</a>
       <li><a href="https://drafts.csswg.org/css-syntax-3/#preserved-tokens">in css-syntax-3, for CSS</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-3/#preserved-white-space">preserved white space</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#primary-filter-primitive-tree">primary filter primitive tree</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#principal-box">principal block-level box</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#principal-writing-mode">principal writing mode</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#propagate">propagate</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#propagate">propagation</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#proportional-nums">proportional-nums</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#proportional-width">proportional-width</a>
     <li><a href="https://drafts.csswg.org/css2/selector.html#x23">pseudo-classes</a>
     <li><a href="https://drafts.csswg.org/css2/selector.html#x22">pseudo-elements</a>
     <li>
      purple
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#purple">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#purple0">in css-color-3</a>
      </ul>
     <li>
      qualified rule
      <ul>
       <li><a href="https://www.w3.org/TR/css-syntax-3/#qualified-rule">in css-syntax-3</a>
       <li><a href="https://drafts.csswg.org/css-syntax-3/#qualified-rule">in css-syntax-3, for CSS</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#reconsume-the-current-input-code-point">reconsume the current input code point</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#reconsume-the-current-input-token">reconsume the current input token</a>
     <li>
      red
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#red">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#red0">in css-color-3</a>
      </ul>
     <li>
      reference box
      <ul>
       <li><a href="https://drafts.csswg.org/css-shapes-1/#reference-box">in css-shapes-1</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#reference-box">in css-transforms-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-values-3/#reference-pixel">reference pixel</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#region-break">region break</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#relative-length">relative length</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x34">relative positioning</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#remaining-fragmentainer-extent">remaining fragmentainer extent</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#remaining-free-space">remaining free space</a>
     <li>
      renderer
      <ul>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#renderer">in css-fonts-3</a>
       <li><a href="https://www.w3.org/TR/css3-images/#renderer">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-speech-1/#renderer">in css-speech-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#representation">representation</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#reset-only-sub-property">reset-only sub-property</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#resolved-type">resolved type</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#transition-reversing-adjusted-start-value">reversing-adjusted start value</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#transition-reversing-shortening-factor">reversing shortening factor</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical-right">right</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#rosybrown">rosybrown</a>
     <li><a href="https://www.w3.org/TR/css-grid-1/#row-axis">row axis</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#royalblue">royalblue</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#ruby">ruby</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#running-transition">running transition</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#saddlebrown">saddlebrown</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#salmon">salmon</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#sandybrown">sandybrown</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#sans-serif">sans-serif</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#scaled-flex-shrink-factor">scaled flex shrink factor</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#x29">scope</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#x1">screen reader</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#unicode-script">script property</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#scrollbar">scrollbar</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#seagreen">seagreen</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#seashell">seashell</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#segment-break">segment break</a>
     <li>
      selector
      <ul>
       <li><a href="https://drafts.csswg.org/css2/selector.html#x4">in css2</a>
       <li><a href="https://drafts.csswg.org/selectors-3/#selector">in selectors-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-align-3/#self-alignment">self-alignment</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#self-alignment-properties">self-alignment properties</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#semi-condensed-">semi-condensed</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#semi-expanded">semi-expanded</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sequence-of-simple-selectors">sequence of simple selectors</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#serialize-an-anb-value">serialize an &lt;an+b> value</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#serif">serif</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#shared-alignment-context">shared alignment context</a>
     <li><a href="https://drafts.csswg.org/css2/page.html#x0">sheets</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#shorthand-property">shorthand</a>
     <li><a href="https://drafts.csswg.org/css2/about.html#x1">shorthand properties</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#shorthand-property">shorthand property</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#sienna">sienna</a>
     <li>
      silver
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#silver">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#silver0">in css-color-3</a>
      </ul>
     <li>
      simple block
      <ul>
       <li><a href="https://www.w3.org/TR/css-syntax-3/#simple-block">in css-syntax-3</a>
       <li><a href="https://drafts.csswg.org/css-syntax-3/#simple-block">in css-syntax-3, for CSS</a>
      </ul>
     <li>
      simple selector
      <ul>
       <li><a href="https://drafts.csswg.org/css2/selector.html#simple-selector">in css2</a>
       <li><a href="https://drafts.csswg.org/selectors-3/#simple-selector">in selectors-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#simplified">simplified</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#single-line-flex-container">single-line flex container</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-rows-track-sizing-function">sizing function</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#skyblue">skyblue</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#slashed-zero">slashed-zero</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#slateblue">slateblue</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#slategray">slategray</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#slategrey">slategrey</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#kana-small">small</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#small-caps">small-caps</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#kana-small">small kana</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#snow">snow</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#soft-wrap-break">soft wrap break</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#soft-wrap-opportunity">soft wrap opportunity</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#source">source</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#space-to-fill">space to fill</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#span-count">span count</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#spanner">spanner</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#spanning-element">spanning element</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#specified-size">specified size</a>
     <li>
      specified size suggestion
      <ul>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#specified-size-suggestion">in css-flexbox-1</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#specified-size-suggestion">in css-grid-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#specified-value">specified value</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#spread-break">spread break</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#spread-distance">spread distance</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#springgreen">springgreen</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#stacked-fractions">stacked-fractions</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x43">stacking context</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#stack-level">stack level</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#start">start</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#starting-point">starting point</a>
     <li><a href="https://www.w3.org/TR/css-syntax-3/#unicode-range-start">start of the range</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-an-identifier">starts with an identifier</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-a-number">starts with a number</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-two-code-points-are-a-valid-escape">starts with a valid escape</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#transition-start-time">start time</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#transition-start-value">start value</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-an-identifier">start with an identifier</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-a-number">start with a number</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#static-position-rectangle">static position rectangle</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#static-position-rectangle">static-position rectangle</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#steelblue">steelblue</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#stop-or-comma">stop or comma</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#stretched">stretched</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#string">string</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#strings-def">strings</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#stroke-bounding-box">stroke bounding box</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#structural-pseudo-classes">structural pseudo-classes</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#strut-size">strut size</a>
     <li><a href="https://drafts.csswg.org/css-style-attr-1/#style-attribute">style attribute</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#style-change-event">style change event</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#style-rule">style rule</a>
     <li>
      style sheet
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#style-sheet">in css-backgrounds-3</a>
       <li><a href="https://www.w3.org/TR/css-namespaces-3/#style-sheet">in css-namespaces-3</a>
       <li><a href="https://drafts.csswg.org/css-speech-1/#style-sheet">in css-speech-1</a>
      </ul>
     <li>
      style sheet!!as conformance class
      <ul>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#style-sheet">in css-fonts-3</a>
       <li><a href="https://www.w3.org/TR/css3-images/#style-sheet">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-speech-1/#style-sheet0">in css-speech-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#sub">sub</a>
     <li><a href="https://drafts.csswg.org/css2/selector.html#subject">subjects</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#subjects-of-the-selector">subjects of the selector</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#longhand">sub-property</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#subsequent-sibling-combinator">subsequent-sibling combinator</a>
     <li><a href="https://drafts.csswg.org/css-variables-1/#substitute-a-var">substitute a var()</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#super">super</a>
     <li>
      support
      <ul>
       <li><a href="https://www.w3.org/TR/css3-conditional/#dfn-support">in css-conditional-3</a>
       <li><a href="https://drafts.csswg.org/css-conditional-3/#dfn-support">in css-conditional-3, for CSS</a>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#support">in css-fonts-3</a>
      </ul>
     <li><a href="https://www.w3.org/TR/css3-conditional/#supports_condition">supports_condition</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#supports_condition_in_parens">supports_condition_in_parens</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#supports_conjunction">supports_conjunction</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#supports_declaration_condition">supports_declaration_condition</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#supports_disjunction">supports_disjunction</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#supports_negation">supports_negation</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#atsupports-rule">'@supports' rule</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#supports_rule">supports_rule</a>
     <li><a href="https://www.w3.org/TR/css3-conditional/#supports_sym">supports_sym</a>
     <li><a href="https://www.w3.org/TR/css-syntax-3/#surrogate-code-point">surrogate code point</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#synthesize-baseline">synthesize baseline</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#synthesize-baseline">synthesized baseline</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#system-font-fallback">system font fallback</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#x2">table element</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#tab-stop">tab stop</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#tabular-nums">tabular-nums</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#tan">tan</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#target-main-size">target main size</a>
     <li>
      teal
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#teal">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#teal0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-values-3/#textual-data-types">textual data types</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#thistle">thistle</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#threeddarkshadow">threeddarkshadow</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#threedface">threedface</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#threedhighlight">threedhighlight</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#threedlightshadow">threedlightshadow</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#threedshadow">threedshadow</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#time-def">time</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#titling-caps">titling-caps</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#tomato">tomato</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#physical-top">top</a>
     <li><a href="https://www.w3.org/TR/css-syntax-3/#top-level-flag">top-level flag</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#tracking">tracking</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#track-list">track list</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#track-section">track section</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#track-sizing-algorithm">track sizing algorithm</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-rows-track-sizing-function">track sizing function</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#traditional">traditional</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#transfer-function-element">transfer function element</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#transfer-function-element-attributes">transfer function element attributes</a>
     <li>
      transferred size suggestion
      <ul>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#transferred-size-suggestion">in css-flexbox-1</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#transferred-size-suggestion">in css-grid-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#transformable-element">transformable element</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#transformation-matrix">transformation matrix</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#transformed-element">transformed element</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#transitionable">transitionable</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade-origin-transition">transition origin</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#transparent-def">transparent</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-areas-trash-token">trash token</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#triangle">triangle</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#trinary">trinary</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#turquoise">turquoise</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#type-selector">type selector</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#typographic-character-unit">typographic character</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#typographic-character-unit">typographic character unit</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#typographic-letter-unit">typographic letter unit</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#typographic-mode">typographic mode</a>
     <li>
      ua
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#ua">in css-backgrounds-3</a>
       <li><a href="https://drafts.csswg.org/css-speech-1/#ua">in css-speech-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade-origin-ua">ua origin</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade-origin-ua">ua style sheet</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#ultra-condensed">ultra-condensed</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#ultra-expanded">ultra-expanded</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#under">under</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#unforced-break">unforced break</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#unicase">unicase</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#unicode-general-category">unicode category</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#unicode-east-asian-width">unicode east asian width</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#unicode-general-category">unicode general category</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#unicode-script">unicode script</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#universal-selector0">universal selector</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#writing-system-known">unknown</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#unoccupied">unoccupied</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#upper-alpha-legal">upper-alpha-legal</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#uppercase-letter">uppercase letter</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#url">url</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#use-a-negative-sign">use a negative sign</a>
     <li>
      used value
      <ul>
       <li><a href="https://drafts.csswg.org/css-cascade-3/#used-value">in css-cascade-3</a>
       <li><a href="https://drafts.csswg.org/css2/cascade.html#usedValue">in css2</a>
      </ul>
     <li>
      user agent
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#user-agent">in css-backgrounds-3</a>
       <li><a href="https://drafts.csswg.org/css-speech-1/#user-agent">in css-speech-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade-origin-ua">user agent origin</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade-origin-ua">user agent style sheet</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#user-coordinate-system">user coordinate system</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade-origin-user">user origin</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#cascade-origin-user">user style sheet</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#use-a-negative-sign">uses a negative sign</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#invalid-image">valid image</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#css-value-definition-syntax">value definition syntax</a>
     <li><a href="https://drafts.csswg.org/css-variables-1/#substitute-a-var">var() substitution</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#y-axis">vertical axis</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#vertical-block-flow">vertical block flow</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#vertical-dimension">vertical dimension</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#vertical-offset">vertical offset</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#vertical-only">vertical-only</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#vertical-script">vertical script</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#vertical-writing-mode">vertical writing mode</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#x1">viewport</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#viewport-percentage-lengths">viewport-percentage lengths</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#violet">violet</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#visual-angle-unit">visual angle unit</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#box-model-def">visual box model</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#weight">weight</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#wheat">wheat</a>
     <li>
      white
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#white">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#white0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#whitesmoke">whitesmoke</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#white-space">white space</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#whitespace">whitespace</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#white-space">white space characters</a>
     <li>
      width
      <ul>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#width">in css-fonts-3</a>
       <li><a href="https://drafts.csswg.org/css-writing-modes-3/#width">in css-writing-modes-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#window">window</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#windowframe">windowframe</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#windowtext">windowtext</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#word-separator">word separator</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#word-separator">word-separator character</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-an-identifier">would start an identifier</a>
     <li><a href="https://drafts.csswg.org/css-syntax-3/#check-if-three-code-points-would-start-a-number">would start a number</a>
     <li>
      wrap
      <ul>
       <li><a href="https://drafts.csswg.org/css-shapes-1/#wrap">in css-shapes-1</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#wrapping">in css-text-3</a>
      </ul>
     <li>
      wrapping
      <ul>
       <li><a href="https://drafts.csswg.org/css-shapes-1/#wrap">in css-shapes-1</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#wrapping">in css-text-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#writing-mode">writing mode</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#x-axis">x-axis</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#y-axis">y-axis</a>
     <li>
      yellow
      <ul>
       <li><a href="https://drafts.csswg.org/css-color-3/#yellow">in css-color-3</a>
       <li><a href="https://drafts.csswg.org/css-color-3/#yellow0">in css-color-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-color-3/#yellowgreen">yellowgreen</a>
    </ul>
   </div>
   <h3 class="heading settled" data-level="4.2" id="selectors"><span class="secno">4.2. </span><span class="content">Selector Index</span><a class="self-link" href="#selectors"></a></h3>
   <div data-link-spec="
	css2,
	css-syntax-3,
	css-style-attr-1,
	mediaqueries-3,
	css-conditional-3,
	css-namespaces-3,
	selectors-3,
	css-cascade-3,
	css-values-3,
	css-color-3,
	css-backgrounds-3,
	css-images-3,
	css-fonts-3,
	css-multicol-1,
	css-ui-3,
	compositing-1,
	css-writing-modes-3,
	css-transitions-1,
	css-animations-1,
	css-flexbox-1,
	css-transforms-1,
	css-variables-1,
	css-text-3,
	css-counter-styles-3,
	css-masking-1,
	css-shapes-1,
	css-text-decor-3,
	css-will-change-1,
	css-speech-1,
	css-align-3,
	css-grid-1,
	filter-effects-1,
	css-break-3" data-link-status="TR">
    <ul class="index">
     <li><a href="https://drafts.csswg.org/selectors-3/#x">*</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-active">:active</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-after">::after</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-before">::before</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-checked">:checked</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-disabled">:disabled</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-empty">:empty</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-enabled">:enabled</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-first-child">:first-child</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#first-letter0">::first-letter</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-first-line">::first-line</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-first-of-type">:first-of-type</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-focus">:focus</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-hover">:hover</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-lang">:lang</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-last-child">:last-child</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-last-of-type">:last-of-type</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-link">:link</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-not">:not()</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-nth-child">:nth-child()</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-nth-last-child">:nth-last-child()</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-nth-last-of-type">:nth-last-of-type()</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-nth-of-type">:nth-of-type()</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-only-child">:only-child</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-only-of-type">:only-of-type</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-root">:root</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-target">:target</a>
     <li><a href="https://drafts.csswg.org/selectors-3/#sel-visited">:visited</a>
    </ul>
   </div>
   <h3 class="heading settled" data-level="4.3" id="at-rules"><span class="secno">4.3. </span><span class="content"> At-Rule Index</span><a class="self-link" href="#at-rules"></a></h3>
   <div data-link-spec="
	css2,
	css-syntax-3,
	css-style-attr-1,
	mediaqueries-3,
	css-conditional-3,
	css-namespaces-3,
	selectors-3,
	css-cascade-3,
	css-values-3,
	css-color-3,
	css-backgrounds-3,
	css-images-3,
	css-fonts-3,
	css-multicol-1,
	css-ui-3,
	compositing-1,
	css-writing-modes-3,
	css-transitions-1,
	css-animations-1,
	css-flexbox-1,
	css-transforms-1,
	css-variables-1,
	css-text-3,
	css-counter-styles-3,
	css-masking-1,
	css-shapes-1,
	css-text-decor-3,
	css-will-change-1,
	css-speech-1,
	css-align-3,
	css-grid-1,
	filter-effects-1,
	css-break-3" data-link-status="TR">
    <ul class="index">
     <li><a href="https://drafts.csswg.org/css-syntax-3/#at-ruledef-charset">@charset</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#at-ruledef-counter-style">@counter-style</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#at-font-face-rule">@font-face</a>
     <li>
      @import
      <ul>
       <li><a href="https://drafts.csswg.org/css-cascade-3/#at-ruledef-import">in css-cascade-3</a>
       <li><a href="https://drafts.csswg.org/css2/cascade.html#x7">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-animations-1/#at-ruledef-keyframes">@keyframes</a>
     <li><a href="https://drafts.csswg.org/css-conditional-3/#at-ruledef-media">@media</a>
     <li><a href="https://drafts.csswg.org/css-conditional-3/#at-ruledef-supports">@supports</a>
    </ul>
   </div>
   <h3 class="heading settled" data-level="4.4" id="properties"><span class="secno">4.4. </span><span class="content">Property Index</span><a class="self-link" href="#properties"></a></h3>
   <div data-link-spec="
	css2,
	css-syntax-3,
	css-style-attr-1,
	mediaqueries-3,
	css-conditional-3,
	css-namespaces-3,
	selectors-3,
	css-cascade-3,
	css-values-3,
	css-color-3,
	css-backgrounds-3,
	css-images-3,
	css-fonts-3,
	css-multicol-1,
	css-ui-3,
	compositing-1,
	css-writing-modes-3,
	css-transitions-1,
	css-animations-1,
	css-flexbox-1,
	css-transforms-1,
	css-variables-1,
	css-text-3,
	css-counter-styles-3,
	css-masking-1,
	css-shapes-1,
	css-text-decor-3,
	css-will-change-1,
	css-speech-1,
	css-align-3,
	css-grid-1,
	filter-effects-1,
	css-break-3" data-link-status="TR">
    <ul class="index">
     <li><a href="https://drafts.csswg.org/css-variables-1/#propdef-">--*</a>
     <li>
      align-content
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#propdef-align-content">in css-align-3</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-align-content">in css-flexbox-1</a>
      </ul>
     <li>
      align-items
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#propdef-align-items">in css-align-3</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-align-items">in css-flexbox-1</a>
      </ul>
     <li>
      align-self
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#propdef-align-self">in css-align-3</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-align-self">in css-flexbox-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#propdef-all">all</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation">animation</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-delay">animation-delay</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-direction">animation-direction</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-duration">animation-duration</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-fill-mode">animation-fill-mode</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-iteration-count">animation-iteration-count</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-name">animation-name</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-play-state">animation-play-state</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#propdef-animation-timing-function">animation-timing-function</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-azimuth">azimuth</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background">background</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-attachment">background-attachment</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#propdef-background-blend-mode">background-blend-mode</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-clip">background-clip</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-color">background-color</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-image">background-image</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-origin">background-origin</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-position">background-position</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-repeat">background-repeat</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-background-size">background-size</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border">border</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom">border-bottom</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom-color">border-bottom-color</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom-left-radius">border-bottom-left-radius</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom-right-radius">border-bottom-right-radius</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom-style">border-bottom-style</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-bottom-width">border-bottom-width</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#propdef-border-collapse">border-collapse</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-color">border-color</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image">border-image</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-outset">border-image-outset</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-repeat">border-image-repeat</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-slice">border-image-slice</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-source">border-image-source</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-image-width">border-image-width</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-left">border-left</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-left-color">border-left-color</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-left-style">border-left-style</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-left-width">border-left-width</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-radius">border-radius</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-right">border-right</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-right-color">border-right-color</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-right-style">border-right-style</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-right-width">border-right-width</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#propdef-border-spacing">border-spacing</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-style">border-style</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top">border-top</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top-color">border-top-color</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top-left-radius">border-top-left-radius</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top-right-radius">border-top-right-radius</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top-style">border-top-style</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-top-width">border-top-width</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-border-width">border-width</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#propdef-bottom">bottom</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#propdef-box-decoration-break">box-decoration-break</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#propdef-box-shadow">box-shadow</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#propdef-box-sizing">box-sizing</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#propdef-break-after">break-after</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#propdef-break-before">break-before</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#propdef-break-inside">break-inside</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#propdef-caption-side">caption-side</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#propdef-caret-color">caret-color</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#propdef-clear">clear</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-clip">clip</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-clip-path">clip-path</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-clip-rule">clip-rule</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#color0">color</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#propdef-color-interpolation-filters">color-interpolation-filters</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-count">column-count</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-fill">column-fill</a>
     <li>
      column-gap
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#propdef-column-gap">in css-align-3</a>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-gap">in css-multicol-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-rule">column-rule</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-rule-color">column-rule-color</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-rule-style">column-rule-style</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-rule-width">column-rule-width</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-columns">columns</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-span">column-span</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#propdef-column-width">column-width</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#propdef-content">content</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#propdef-counter-increment">counter-increment</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#propdef-counter-reset">counter-reset</a>
     <li>
      cue
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#cue">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-cue">in css2</a>
      </ul>
     <li>
      cue-after
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#cue-after">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-cue-after">in css2</a>
      </ul>
     <li>
      cue-before
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#cue-before">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-cue-before">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-ui-3/#propdef-cursor">cursor</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#propdef-direction">direction</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#propdef-display">display</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-elevation">elevation</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#propdef-empty-cells">empty-cells</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#propdef-filter">filter</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex">flex</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-basis">flex-basis</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-direction">flex-direction</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-flow">flex-flow</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-grow">flex-grow</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-shrink">flex-shrink</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-flex-wrap">flex-wrap</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#propdef-float">float</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#propdef-flood-color">flood-color</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#propdef-flood-opacity">flood-opacity</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font">font</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-family">font-family</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-feature-settings">font-feature-settings</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-kerning">font-kerning</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-size">font-size</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-size-adjust">font-size-adjust</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-stretch">font-stretch</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-style">font-style</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-synthesis">font-synthesis</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant">font-variant</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant-caps">font-variant-caps</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant-east-asian">font-variant-east-asian</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant-ligatures">font-variant-ligatures</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant-numeric">font-variant-numeric</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-variant-position">font-variant-position</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#propdef-font-weight">font-weight</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#propdef-gap">gap</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#propdef-mix">globalcompositeoperation</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#propdef-glyph-orientation-vertical">glyph-orientation-vertical</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid">grid</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-area">grid-area</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-columns">grid-auto-columns</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-flow">grid-auto-flow</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-auto-rows">grid-auto-rows</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-column">grid-column</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-column-end">grid-column-end</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#propdef-grid-column-gap">grid-column-gap</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-column-start">grid-column-start</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#propdef-grid-gap">grid-gap</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-row">grid-row</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-row-end">grid-row-end</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#propdef-grid-row-gap">grid-row-gap</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-row-start">grid-row-start</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template">grid-template</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-areas">grid-template-areas</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-columns">grid-template-columns</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#propdef-grid-template-rows">grid-template-rows</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-hanging-punctuation">hanging-punctuation</a>
     <li><a href="https://drafts.csswg.org/css2/visudet.html#propdef-height">height</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-hyphens">hyphens</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#propdef-image-orientation">image-orientation</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#propdef-image-rendering">image-rendering</a>
     <li><a href="https://www.w3.org/TR/css3-images/#image-resolution">image-resolution</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#propdef-isolation">isolation</a>
     <li>
      justify-content
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#propdef-justify-content">in css-align-3</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-justify-content">in css-flexbox-1</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-align-3/#propdef-justify-items">justify-items</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#propdef-justify-self">justify-self</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#propdef-left">left</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-letter-spacing">letter-spacing</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#propdef-lighting-color">lighting-color</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-line-break">line-break</a>
     <li><a href="https://drafts.csswg.org/css2/visudet.html#propdef-line-height">line-height</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#propdef-list-style">list-style</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#propdef-list-style-image">list-style-image</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#propdef-list-style-position">list-style-position</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#propdef-list-style-type">list-style-type</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#propdef-margin">margin</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#propdef-margin-bottom">margin-bottom</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#propdef-margin-left">margin-left</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#propdef-margin-right">margin-right</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#propdef-margin-top">margin-top</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask">mask</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border">mask-border</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-mode">mask-border-mode</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-outset">mask-border-outset</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-repeat">mask-border-repeat</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-slice">mask-border-slice</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-source">mask-border-source</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-border-width">mask-border-width</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-clip">mask-clip</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-composite">mask-composite</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-image">mask-image</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-mode">mask-mode</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-origin">mask-origin</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-position">mask-position</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-repeat">mask-repeat</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-size">mask-size</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#propdef-mask-type">mask-type</a>
     <li><a href="https://drafts.csswg.org/css2/visudet.html#propdef-max-height">max-height</a>
     <li><a href="https://drafts.csswg.org/css2/visudet.html#propdef-max-width">max-width</a>
     <li><a href="https://drafts.csswg.org/css2/visudet.html#propdef-min-height">min-height</a>
     <li><a href="https://drafts.csswg.org/css2/visudet.html#propdef-min-width">min-width</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#propdef-mix-blend-mode">mix-blend-mode</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#propdef-object-fit">object-fit</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#propdef-object-position">object-position</a>
     <li><a href="https://drafts.csswg.org/css-color-3/#opacity">opacity</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#propdef-order">order</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#propdef-orphans">orphans</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#propdef-outline">outline</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#propdef-outline-color">outline-color</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#propdef-outline-offset">outline-offset</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#propdef-outline-style">outline-style</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#propdef-outline-width">outline-width</a>
     <li><a href="https://drafts.csswg.org/css2/visufx.html#propdef-overflow">overflow</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-overflow-wrap">overflow-wrap</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#propdef-padding">padding</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#propdef-padding-bottom">padding-bottom</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#propdef-padding-left">padding-left</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#propdef-padding-right">padding-right</a>
     <li><a href="https://drafts.csswg.org/css2/box.html#propdef-padding-top">padding-top</a>
     <li><a href="https://drafts.csswg.org/css2/page.html#propdef-page-break-after">page-break-after</a>
     <li><a href="https://drafts.csswg.org/css2/page.html#propdef-page-break-before">page-break-before</a>
     <li><a href="https://drafts.csswg.org/css2/page.html#propdef-page-break-inside">page-break-inside</a>
     <li>
      pause
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#pause">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-pause">in css2</a>
      </ul>
     <li>
      pause-after
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#pause-after">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-pause-after">in css2</a>
      </ul>
     <li>
      pause-before
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#pause-before">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-pause-before">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-pitch">pitch</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-pitch-range">pitch-range</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#propdef-place-content">place-content</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#propdef-place-items">place-items</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#propdef-place-self">place-self</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-play-during">play-during</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#propdef-position">position</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#propdef-quotes">quotes</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#propdef-resize">resize</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#rest">rest</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#rest-after">rest-after</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#rest-before">rest-before</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-richness">richness</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#propdef-right">right</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#propdef-row-gap">row-gap</a>
     <li><a href="https://drafts.csswg.org/css-shapes-1/#propdef-shape-image-threshold">shape-image-threshold</a>
     <li><a href="https://drafts.csswg.org/css-shapes-1/#propdef-shape-margin">shape-margin</a>
     <li><a href="https://drafts.csswg.org/css-shapes-1/#propdef-shape-outside">shape-outside</a>
     <li>
      speak
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#speak">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-speak">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-speech-1/#speak-as">speak-as</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-speak-header">speak-header</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-speak-numeral">speak-numeral</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-speak-punctuation">speak-punctuation</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-speech-rate">speech-rate</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-stress">stress</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#propdef-table-layout">table-layout</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-tab-size">tab-size</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-align">text-align</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-align-all">text-align-all</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-align-last">text-align-last</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#propdef-text-combine-upright">text-combine-upright</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-decoration">text-decoration</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-decoration-color">text-decoration-color</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-decoration-line">text-decoration-line</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-decoration-style">text-decoration-style</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-emphasis">text-emphasis</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-emphasis-color">text-emphasis-color</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-emphasis-position">text-emphasis-position</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-emphasis-style">text-emphasis-style</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-indent">text-indent</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-justify">text-justify</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#propdef-text-orientation">text-orientation</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#propdef-text-overflow">text-overflow</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-shadow">text-shadow</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-text-transform">text-transform</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#propdef-text-underline-position">text-underline-position</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#propdef-top">top</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#propdef-transform">transform</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#propdef-transform-box">transform-box</a>
     <li><a href="https://drafts.csswg.org/css-transforms-1/#propdef-transform-origin">transform-origin</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#propdef-transition">transition</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-delay">transition-delay</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-duration">transition-duration</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-property">transition-property</a>
     <li><a href="https://drafts.csswg.org/css-transitions-1/#propdef-transition-timing-function">transition-timing-function</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#propdef-unicode-bidi">unicode-bidi</a>
     <li><a href="https://drafts.csswg.org/css2/visudet.html#propdef-vertical-align">vertical-align</a>
     <li><a href="https://drafts.csswg.org/css2/visufx.html#propdef-visibility">visibility</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#voice-balance">voice-balance</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#voice-duration">voice-duration</a>
     <li>
      voice-family
      <ul>
       <li><a href="https://drafts.csswg.org/css-speech-1/#voice-family">in css-speech-1</a>
       <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-voice-family">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-speech-1/#voice-pitch">voice-pitch</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#voice-range">voice-range</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#voice-rate">voice-rate</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#voice-stress">voice-stress</a>
     <li><a href="https://drafts.csswg.org/css-speech-1/#voice-volume">voice-volume</a>
     <li><a href="https://drafts.csswg.org/css2/aural.html#propdef-volume">volume</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-white-space">white-space</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#propdef-widows">widows</a>
     <li><a href="https://drafts.csswg.org/css2/visudet.html#propdef-width">width</a>
     <li><a href="https://drafts.csswg.org/css-will-change-1/#propdef-will-change">will-change</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-word-break">word-break</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-word-spacing">word-spacing</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#propdef-word-wrap">word-wrap</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#propdef-writing-mode">writing-mode</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#propdef-z-index">z-index</a>
    </ul>
   </div>
   <h3 class="heading settled" data-level="4.5" id="values"><span class="secno">4.5. </span><span class="content">Values Index</span><a class="self-link" href="#values"></a></h3>
   <div data-link-spec="
	css2,
	css-syntax-3,
	css-style-attr-1,
	mediaqueries-3,
	css-conditional-3,
	css-namespaces-3,
	selectors-3,
	css-cascade-3,
	css-values-3,
	css-color-3,
	css-backgrounds-3,
	css-images-3,
	css-fonts-3,
	css-multicol-1,
	css-ui-3,
	compositing-1,
	css-writing-modes-3,
	css-transitions-1,
	css-animations-1,
	css-flexbox-1,
	css-transforms-1,
	css-variables-1,
	css-text-3,
	css-counter-styles-3,
	css-masking-1,
	css-shapes-1,
	css-text-decor-3,
	css-will-change-1,
	css-speech-1,
	css-align-3,
	css-grid-1,
	filter-effects-1,
	css-break-3" data-link-status="TR">
    <ul class="index">
     <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-composite-add">add</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-additive">additive</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-alias">alias</a>
     <li>
      all
      <ul>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-span-all">in css-multicol-1, for column-span</a>
       <li><a href="https://drafts.csswg.org/css-transitions-1/#valdef-transition-property-all">in css-transitions-1, for transition-property</a>
       <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-combine-upright-all">in css-writing-modes-3, for text-combine-upright</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-hanging-punctuation-allow-end">allow-end</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-all-scroll">all-scroll</a>
     <li>
      alpha
      <ul>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-border-mode-alpha">in css-masking-1, for mask-border-mode</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-mode-alpha">in css-masking-1, for mask-mode</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-type-alpha">in css-masking-1, for mask-type</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-alphabetic">alphabetic</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-direction-alternate">alternate</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-direction-alternate-reverse">alternate-reverse</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-orientation-angle">&lt;angle></a>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-orientation-angle-flip">&lt;angle>? flip</a>
     <li>
      anywhere
      <ul>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-line-break-anywhere">in css-text-3, for line-break</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-overflow-wrap-anywhere">in css-text-3, for overflow-wrap</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-arabic-indic">arabic-indic</a>
     <li>
      armenian
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#armenian">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-armenian">in css2</a>
      </ul>
     <li>
      auto
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-self-auto">in css-align-3, for align-self</a>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-auto">in css-align-3, for justify-self</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-size-auto">in css-backgrounds-3, for background-size</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-width-auto">in css-backgrounds-3, for border-image-width</a>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-auto">in css-break-3, for break-before, break-after</a>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-inside-auto">in css-break-3, for break-inside, page-break-inside</a>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-range-auto">in css-counter-styles-3, for @counter-style/range</a>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-auto">in css-counter-styles-3, for @counter-style/speak-as</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-auto">in css-flexbox-1, for align-items, align-self</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-basis-auto">in css-flexbox-1, for flex-basis</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement-auto">in css-grid-1, for &lt;grid-line></a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-auto">in css-grid-1, for grid-template-columns, grid-template-rows</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-rendering-auto">in css-images-3, for image-rendering</a>
       <li><a href="https://www.w3.org/TR/css-masking-1/#valuedef-auto">in css-masking-1, for mask-mode</a>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-count-auto">in css-multicol-1, for column-count</a>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-fill-auto">in css-multicol-1, for column-fill</a>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-width-auto">in css-multicol-1, for column-width</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-hyphens-auto">in css-text-3, for hyphens</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-line-break-auto">in css-text-3, for line-break</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-last-auto">in css-text-3, for text-align-last</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-justify-auto">in css-text-3, for text-justify</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#underline-auto">in css-text-decor-3, for text-underline-position</a>
       <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-caret-color-auto">in css-ui-3, for caret-color</a>
       <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-auto">in css-ui-3, for cursor</a>
       <li><a href="https://drafts.csswg.org/css-will-change-1/#valdef-will-change-auto">in css-will-change-1, for will-change</a>
       <li><a href="https://drafts.fxtf.org/filter-effects-1/#valdef-color-interpolation-filters-auto">in filter-effects-1, for color-interpolation-filters</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-repeat-auto-fill">auto-fill</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-repeat-auto-fit">auto-fit</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-s-auto-column">[ auto-flow &amp;&amp; dense? ] &lt;'grid-auto-rows'>? / &lt;'grid-template-columns'></a>
     <li>
      avoid
      <ul>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-avoid">in css-break-3, for break-before, break-after</a>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-inside-avoid">in css-break-3, for break-inside, page-break-inside</a>
      </ul>
     <li>
      avoid-column
      <ul>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-avoid-column">in css-break-3, for break-before, break-after</a>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-inside-avoid-column">in css-break-3, for break-inside, page-break-inside</a>
      </ul>
     <li>
      avoid-page
      <ul>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-avoid-page">in css-break-3, for break-before, break-after</a>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-inside-avoid-page">in css-break-3, for break-inside, page-break-inside</a>
      </ul>
     <li>
      avoid-region
      <ul>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-avoid-region">in css-break-3, for break-before, break-after</a>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-inside-avoid-region">in css-break-3, for break-inside, page-break-inside</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-fill-mode-backwards">backwards</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-fill-balance">balance</a>
     <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-fill-balance-all">balance-all</a>
     <li>
      baseline
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-baseline">in css-align-3, for justify-self, justify-items, align-content, align-self, align-items, &lt;baseline-position></a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-baseline">in css-flexbox-1, for align-items, align-self</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-outside-basic-shape">&lt;basic-shape></a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-bengali">bengali</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-unicode-bidi-bidi-override">bidi-override</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-blink">blink</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#value-def-block">block</a>
     <li>
      border-box
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-clip-border-box">in css-backgrounds-3, for background-clip</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-origin-border-box">in css-backgrounds-3, for background-origin</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-border-box">in css-masking-1, for mask-clip</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-border-box">in css-masking-1, for mask-origin</a>
       <li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-box-border-box">in css-shapes-1, for &lt;shape-box>, shape-outside</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-box-border-box">in css-transforms-1, for transform-box</a>
       <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-box-sizing-border-box">in css-ui-3, for box-sizing</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-fill-mode-both">both</a>
     <li>
      bottom
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-bottom">in css-backgrounds-3, for background-position</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-origin-bottom">in css-transforms-1, for transform-origin</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-break-break-all">break-all</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-break-spaces">break-spaces</a>
     <li>
      break-word
      <ul>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-overflow-wrap-break-word">in css-text-3, for overflow-wrap</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-break-break-word">in css-text-3, for word-break</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-bullets">bullets</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-cambodian">cambodian</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-capitalize">capitalize</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-cell">cell</a>
     <li>
      center
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-center">in css-align-3, for &lt;self-position>, &lt;content-position></a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-center">in css-backgrounds-3, for background-position</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-center">in css-flexbox-1, for align-content</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-center">in css-flexbox-1, for align-items, align-self</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-justify-content-center">in css-flexbox-1, for justify-content</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-center">in css-text-3, for text-align</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-origin-center">in css-transforms-1, for transform-origin</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-values-3/#ch">ch</a>
     <li>
      circle
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#circle">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-ending-shape-circle">in css-images-3, for &lt;ending-shape></a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-style-circle">in css-text-decor-3, for text-text-emphasis-style</a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-circle">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#cjk-decimal">cjk-decimal</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-cjk-earthly-branch">cjk-earthly-branch</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-cjk-heavenly-stem">cjk-heavenly-stem</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#cjk-ideographic">cjk-ideographic</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#overflow-clip">clip</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#valdef-box-decoration-break-clone">clone</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-close-quote">close-quote</a>
     <li>
      closest-corner
      <ul>
       <li><a href="https://www.w3.org/TR/css3-images/#radial-closest-corner">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-closest-corner">in css-images-3, for &lt;size></a>
      </ul>
     <li>
      closest-side
      <ul>
       <li><a href="https://www.w3.org/TR/css3-images/#radial-closest-side">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-closest-side">in css-images-3, for &lt;size></a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-values-3/#cm">cm</a>
     <li>
      &lt;color>
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-color">in css-backgrounds-3, for box-shadow</a>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-rule-color-color">in css-multicol-1, for column-rule-color</a>
      </ul>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-color">color</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-color-burn">color-burn</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-color-dodge">color-dodge</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-col-resize">col-resize</a>
     <li>
      column
      <ul>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-column">in css-break-3, for break-before, break-after</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-direction-column">in css-flexbox-1, for flex-direction</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-auto-flow-column">in css-grid-1, for grid-auto-flow</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-direction-column-reverse">column-reverse</a>
     <li>
      contain
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-size-contain">in css-backgrounds-3, for background-size</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-object-fit-contain">in css-images-3, for object-fit</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-basis-content">content</a>
     <li>
      content-box
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-clip-content-box">in css-backgrounds-3, for background-clip</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-origin-content-box">in css-backgrounds-3, for background-origin</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-content-box">in css-masking-1, for mask-clip</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-content-box">in css-masking-1, for mask-origin</a>
       <li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-box-content-box">in css-shapes-1, for &lt;shape-box>, shape-outside</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-box-content-box">in css-transforms-1, for transform-box</a>
       <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-box-sizing-content-box">in css-ui-3, for box-sizing</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-will-change-1/#valdef-will-change-contents">contents</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-context-menu">context-menu</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-copy">copy</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-counter-style-name">&lt;counter-style-name></a>
     <li>
      cover
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-size-cover">in css-backgrounds-3, for background-size</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-object-fit-cover">in css-images-3, for object-fit</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-rendering-crisp-edges">crisp-edges</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-crosshair">crosshair</a>
     <li><a href="https://www.w3.org/TR/css3-color/#currentcolor-def">currentcolor</a>
     <li>
      &lt;custom-ident>
      <ul>
       <li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement-slot">in css-grid-1, for &lt;grid-line></a>
       <li><a href="https://drafts.csswg.org/css-will-change-1/#valdef-will-change-custom-ident">in css-will-change-1, for will-change</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-cyclic">cyclic</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-darken">darken</a>
     <li>
      dashed
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-dashed">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#value-def-dashed">in css2</a>
      </ul>
     <li>
      decimal
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#decimal">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-decimal">in css2</a>
      </ul>
     <li>
      decimal-leading-zero
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#decimal-leading-zero">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-decimal-leading-zero">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-default">default</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#deg">deg</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-auto-flow-dense">dense</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-devanagari">devanagari</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-difference">difference</a>
     <li>
      disc
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#disc">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-disc">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#disclosure-closed">disclosure-closed</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#disclosure-open">disclosure-open</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-justify-distribute">distribute</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-style-dot">dot</a>
     <li>
      dotted
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-dotted">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#value-def-dotted">in css2</a>
      </ul>
     <li>
      double
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-double">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#value-def-double">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-style-double-circle">double-circle</a>
     <li>
      dpcm
      <ul>
       <li><a href="https://www.w3.org/TR/css3-images/#dpcm">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-values-3/#dpcm">in css-values-3, for &lt;resolution></a>
      </ul>
     <li>
      dpi
      <ul>
       <li><a href="https://www.w3.org/TR/css3-images/#dpi">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-values-3/#dpi">in css-values-3, for &lt;resolution></a>
      </ul>
     <li>
      dppx
      <ul>
       <li><a href="https://www.w3.org/TR/css3-images/#dppx">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-values-3/#dppx">in css-values-3, for &lt;resolution></a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-indent-each-line">each-line</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-ending-shape-ellipse">ellipse</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#overflow-ellipsis">ellipsis</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#em">em</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-unicode-bidi-embed">embed</a>
     <li>
      end
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-end">in css-align-3, for &lt;self-position>, &lt;content-position></a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-end">in css-text-3, for text-align</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-radial-gradient-ending-shape">&lt;ending-shape></a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-e-resize">e-resize</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-ethiopic-numeric">ethiopic-numeric</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clip-rule-evenodd">evenodd</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-ew-resize">ew-resize</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#ex">ex</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-composite-exclude">exclude</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-exclusion">exclusion</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-extends">extends</a>
     <li>
      farthest-corner
      <ul>
       <li><a href="https://www.w3.org/TR/css3-images/#radial-farthest-corner">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-farthest-corner">in css-images-3, for &lt;size></a>
      </ul>
     <li>
      farthest-side
      <ul>
       <li><a href="https://www.w3.org/TR/css3-images/#radial-farthest-side">in css-images-3</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-farthest-side">in css-images-3, for &lt;size></a>
      </ul>
     <li>
      fill
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#border-image-slice-fill">in css-backgrounds-3, for border-image-slice</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-object-fit-fill">in css-images-3, for object-fit</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-border-slice-fill">in css-masking-1, for mask-border-slice</a>
      </ul>
     <li>
      fill-box
      <ul>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clip-path-fill-box">in css-masking-1, for clip-path</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-fill-box">in css-masking-1, for mask-clip</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-fill-box">in css-masking-1, for mask-origin</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-box-fill-box">in css-transforms-1, for transform-box</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-style-filled">filled</a>
     <li>
      first
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-first-baseline">in css-align-3, for justify-self, justify-items, align-content, align-self, align-items, &lt;baseline-position></a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-hanging-punctuation-first">in css-text-3, for hanging-punctuation</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-first-baseline">first baseline</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-fit-content">fit-content()</a>
     <li>
      fixed
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-attachment-fixed">in css-backgrounds-3, for background-attachment</a>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-fixed">in css-counter-styles-3, for @counter-style/system</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-flex">&lt;flex></a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-display-flex">flex</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-flex-basis">&lt;'flex-basis'></a>
     <li>
      flex-end
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-flex-end">in css-align-3, for &lt;self-position>, &lt;content-position></a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-flex-end">in css-flexbox-1, for align-content</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-flex-end">in css-flexbox-1, for align-items, align-self</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-justify-content-flex-end">in css-flexbox-1, for justify-content</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-flex-grow">&lt;'flex-grow'></a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-flex-shrink">&lt;'flex-shrink'></a>
     <li>
      flex-start
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-flex-start">in css-align-3, for &lt;self-position>, &lt;content-position></a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-flex-start">in css-flexbox-1, for align-content</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-flex-start">in css-flexbox-1, for align-items, align-self</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-justify-content-flex-start">in css-flexbox-1, for justify-content</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-feature-settings-normal-value">font-feature-settings</a>
     <li>
      font-variant
      <ul>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-none-value">in css-fonts-3</a>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-normal-value">in css-fonts-3</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-hanging-punctuation-force-end">force-end</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-fill-mode-forwards">forwards</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-flex-fr">fr</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-orientation-from-image">from-image</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-flex-fr">fr unit</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-full-size-kana">full-size-kana</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-full-width">full-width</a>
     <li>
      georgian
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#georgian">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-georgian">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-grab">grab</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-grabbing">grabbing</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#grad">grad</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-display-grid">grid</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-s-auto-row">&lt;'grid-template-rows'> / [ auto-flow &amp;&amp; dense? ] &lt;'grid-auto-columns'>?</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-rowcol">&lt;'grid-template-rows'> / &lt;'grid-template-columns'></a>
     <li>
      groove
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-groove">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#value-def-groove">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-gujarati">gujarati</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-gurmukhi">gurmukhi</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-indent-hanging">hanging</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-hard-light">hard-light</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#hebrew">hebrew</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-help">help</a>
     <li>
      hidden
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-hidden">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#value-def-hidden">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-rendering-high-quality">high-quality</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#hiragana">hiragana</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#hiragana-iroha">hiragana-iroha</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-writing-mode-horizontal-tb">horizontal-tb</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-hue">hue</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#Hz">hz</a>
     <li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-outside-image">&lt;image></a>
     <li><a href="https://drafts.csswg.org/css-values-3/#in">in</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-iteration-count-infinite">infinite</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#valdef-all-inherit">inherit</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#valdef-all-initial">initial</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#value-def-inline">inline</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#value-def-inline-block">inline-block</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-display-inline-flex">inline-flex</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-display-inline-grid">inline-grid</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#value-def-inline-table">inline-table</a>
     <li>
      inset
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-inset">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#shadow-inset">in css-backgrounds-3, for box-shadow</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#value-def-inset">in css2</a>
      </ul>
     <li>
      &lt;integer>
      <ul>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-order-integer">in css-flexbox-1, for order</a>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-count-integer">in css-multicol-1, for column-count</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement-int">&lt;integer> &amp;&amp; &lt;custom-ident>?</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-justify-inter-character">inter-character</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-composite-intersect">intersect</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-justify-inter-word">inter-word</a>
     <li>
      invert
      <ul>
       <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-outline-color-invert">in css-ui-3, for outline-color</a>
       <li><a href="https://drafts.csswg.org/css2/ui.html#value-def-invert">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-unicode-bidi-isolate">isolate</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-unicode-bidi-isolate-override">isolate-override</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#japanese-formal">japanese-formal</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#japanese-informal">japanese-informal</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-justify">justify</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-justify-all">justify-all</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-kannada">kannada</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#katakana">katakana</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#katakana-iroha">katakana-iroha</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-break-keep-all">keep-all</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-name-keyframes-name">&lt;keyframes-name></a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-khmer">khmer</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#kHz">khz</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#korean-hangul-formal">korean-hangul-formal</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#korean-hanja-formal">korean-hanja-formal</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#korean-hanja-informal">korean-hanja-informal</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-lao">lao</a>
     <li>
      last
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-last-baseline">in css-align-3, for justify-self, justify-items, align-content, align-self, align-items, &lt;baseline-position></a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-hanging-punctuation-last">in css-text-3, for hanging-punctuation</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-last-baseline">last baseline</a>
     <li>
      left
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-content-left">in css-align-3, for justify-content, justify-self, justify-items</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-left">in css-backgrounds-3, for background-position</a>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-left">in css-break-3, for break-before, break-after</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-left">in css-text-3, for text-align</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-position-left">in css-text-decor-3, for text-text-emphasis-position</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#underline-left">in css-text-decor-3, for text-underline-position</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-origin-left">in css-transforms-1, for transform-origin</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-items-legacy">legacy</a>
     <li>
      &lt;length>
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-length">in css-backgrounds-3, for background-position</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-length">in css-images-3, for &lt;size></a>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-width-length">in css-multicol-1, for column-width</a>
       <li><a href="https://www.w3.org/TR/css-shapes-1/#valuedef-length">in css-shapes-1, for shape-margin</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-letter-spacing-length">in css-text-3, for letter-spacing</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-indent-length">in css-text-3, for text-indent</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-spacing-length">in css-text-3, for word-spacing</a>
      </ul>
     <li>
      &lt;length-percentage>
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-size-length-percentage">in css-backgrounds-3, for background-size</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-width-length-percentage">in css-backgrounds-3, for border-image-width</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-length-percentage">in css-grid-1, for grid-template-columns, grid-template-rows</a>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-gap-length-percentage">in css-multicol-1, for column-gap</a>
       <li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-margin-length-percentage">in css-shapes-1, for shape-margin</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-size-length-percentage2">&lt;length-percentage>{2}</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-lighten">lighten</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#valdef-color-interpolation-filters-linearrgb">linearrgb</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-template-ascii">[ &lt;line-names>? &lt;string> &lt;track-size>? &lt;line-names>? ]+ [ / &lt;explicit-track-list> ]?</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-line-through">line-through</a>
     <li><a href="https://drafts.csswg.org/css2/visuren.html#value-def-list-item">list-item</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-attachment-local">local</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-line-break-loose">loose</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#lower-alpha">lower-alpha</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-lower-armenian">lower-armenian</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-lowercase">lowercase</a>
     <li>
      lower-greek
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#lower-greek">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-lower-greek">in css2</a>
      </ul>
     <li>
      lower-latin
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#lower-latin">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-lower-latin">in css2</a>
      </ul>
     <li>
      lower-roman
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#lower-roman">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-lower-roman">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-direction-ltr">ltr</a>
     <li>
      luminance
      <ul>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-border-mode-luminance">in css-masking-1, for mask-border-mode</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-mode-luminance">in css-masking-1, for mask-mode</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-type-luminance">in css-masking-1, for mask-type</a>
      </ul>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-luminosity">luminosity</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-malayalam">malayalam</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-hyphens-manual">manual</a>
     <li>
      margin-box
      <ul>
       <li><a href="https://www.w3.org/TR/css-masking-1/#valuedef-margin-box0">in css-masking-1, for mask-clip</a>
       <li><a href="https://www.w3.org/TR/css-masking-1/#valuedef-margin-box">in css-masking-1, for mask-origin</a>
       <li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-box-margin-box">in css-shapes-1, for &lt;shape-box>, shape-outside</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-match-parent">match-parent</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-mode-match-source">match-source</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-max-content">max-content</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-width-medium">medium</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-min-content">min-content</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-columns-minmax">minmax()</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-orientation-mixed">mixed</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#mm">mm</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-mongolian">mongolian</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-move">move</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#ms">ms</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-multiply">multiply</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-myanmar">myanmar</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-ne-resize">ne-resize</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-nesw-resize">nesw-resize</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-no-clip">no-clip</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-no-close-quote">no-close-quote</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-no-drop">no-drop</a>
     <li>
      none
      <ul>
       <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-fill-mode-none">in css-animations-1, for animation-fill-mode</a>
       <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-name-none">in css-animations-1, for animation-name</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-none">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-image-none">in css-backgrounds-3, for background-image</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#box-shadow-none">in css-backgrounds-3, for box-shadow</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-none">in css-flexbox-1, for flex</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-none">in css-grid-1, for grid-template</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-areas-none">in css-grid-1, for grid-template-areas</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-rows-none">in css-grid-1, for grid-template-rows, grid-template-columns</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-orientation-none">in css-images-3, for image-orientation</a>
       <li><a href="https://drafts.csswg.org/css-images-3/#valdef-object-fit-none">in css-images-3, for object-fit</a>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-span-none">in css-multicol-1, for column-span</a>
       <li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-outside-none">in css-shapes-1, for shape-outside</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-hanging-punctuation-none">in css-text-3, for hanging-punctuation</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-hyphens-none">in css-text-3, for hyphens</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-justify-none">in css-text-3, for text-justify</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-none">in css-text-3, for text-transform</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-none">in css-text-decor-3, for text-decoration-line</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-style-none">in css-text-decor-3, for text-text-emphasis-style</a>
       <li><a href="https://drafts.csswg.org/css-transitions-1/#valdef-transition-property-none">in css-transitions-1, for transition-property</a>
       <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-none">in css-ui-3, for cursor</a>
       <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-combine-upright-none">in css-writing-modes-3, for text-combine-upright</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#value-def-bo-none">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-none-value">none!!font-variant</a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clip-rule-nonzero">nonzero</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-no-open-quote">no-open-quote</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-no-repeat">no-repeat</a>
     <li>
      normal
      <ul>
       <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-normal">in compositing-1, for &lt;blend-mode></a>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-self-normal">in css-align-3, for align-self</a>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-content-normal">in css-align-3, for justify-content, align-content</a>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-normal">in css-align-3, for justify-self</a>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-row-gap-normal">in css-align-3, for row-gap, column-gap, gap</a>
       <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-direction-normal">in css-animations-1, for animation-direction</a>
       <li><a href="https://drafts.csswg.org/css-multicol-1/#valdef-column-gap-normal">in css-multicol-1, for column-gap</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-letter-spacing-normal">in css-text-3, for letter-spacing</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-line-break-normal">in css-text-3, for line-break</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-overflow-wrap-normal">in css-text-3, for overflow-wrap</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-normal">in css-text-3, for white-space</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-break-normal">in css-text-3, for word-break</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-word-spacing-normal">in css-text-3, for word-spacing</a>
       <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-unicode-bidi-normal">in css-writing-modes-3, for unicode-bidi</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-feature-settings-normal-value">normal!!font-feature-settings</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#font-variant-normal-value">normal!!font-variant</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-not-allowed">not-allowed</a>
     <li>
      nowrap
      <ul>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-wrap-nowrap">in css-flexbox-1, for flex-wrap</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-nowrap">in css-text-3, for white-space</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-n-resize">n-resize</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-ns-resize">ns-resize</a>
     <li>
      &lt;number>
      <ul>
       <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-iteration-count-number">in css-animations-1, for animation-iteration-count</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-slice-number">in css-backgrounds-3, for border-image-slice</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-width-number">in css-backgrounds-3, for border-image-width</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-grow-number">in css-flexbox-1, for flex-grow</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-shrink-number">in css-flexbox-1, for flex-shrink</a>
       <li><a href="https://drafts.csswg.org/css-fonts-3/#aspect-ratio-value">in css-fonts-3, for font-size-adjust</a>
       <li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-image-threshold-number">in css-shapes-1, for shape-image-threshold</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-numbers">numbers</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-system-numeric">numeric</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-nw-resize">nw-resize</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-nwse-resize">nwse-resize</a>
     <li>
      objectboundingbox
      <ul>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clippathunits-objectboundingbox">in css-masking-1, for clipPathUnits</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-maskcontentunits-objectboundingbox">in css-masking-1, for maskContentUnits</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-maskunits-objectboundingbox">in css-masking-1, for maskUnits</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-open">open</a>
     <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-open-quote">open-quote</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-oriya">oriya</a>
     <li>
      outset
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-outset">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#value-def-outset">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-position-over">over</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-overlay">overlay</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-overline">overline</a>
     <li>
      padding-box
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-clip-padding-box">in css-backgrounds-3, for background-clip</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-origin-padding-box">in css-backgrounds-3, for background-origin</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-padding-box">in css-masking-1, for mask-clip</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-padding-box">in css-masking-1, for mask-origin</a>
       <li><a href="https://drafts.csswg.org/css-shapes-1/#valdef-shape-box-padding-box">in css-shapes-1, for &lt;shape-box>, shape-outside</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-page">page</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-play-state-paused">paused</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#pc">pc</a>
     <li>
      &lt;percentage>
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-percentage">in css-backgrounds-3, for background-position</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-slice-percentage">in css-backgrounds-3, for border-image-slice</a>
       <li><a href="https://www.w3.org/TR/css-shapes-1/#valuedef-percentage">in css-shapes-1, for shape-margin</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-indent-percentage">in css-text-3, for text-indent</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-persian">persian</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-rendering-pixelated">pixelated</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#px">pixel unit</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-unicode-bidi-plaintext">plaintext</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-pointer">pointer</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-radial-gradient-position">&lt;position></a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre">pre</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-line">pre-line</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-white-space-pre-wrap">pre-wrap</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-progress">progress</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#pt">pt</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#px">px</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#Q">q</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#rad">rad</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-recto">recto</a>
     <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-region">region</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#rem">rem</a>
     <li>
      repeat
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-repeat">in css-backgrounds-3, for background-repeat</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-repeat-repeat">in css-backgrounds-3, for border-image-repeat</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-repeat-x">repeat-x</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-repeat-y">repeat-y</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-direction-reverse">reverse</a>
     <li>
      ridge
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-ridge">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#value-def-ridge">in css2</a>
      </ul>
     <li>
      right
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-content-right">in css-align-3, for justify-content, justify-self, justify-items</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-right">in css-backgrounds-3, for background-position</a>
       <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-right">in css-break-3, for break-before, break-after</a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-right">in css-text-3, for text-align</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-position-right">in css-text-decor-3, for text-text-emphasis-position</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#underline-right">in css-text-decor-3, for text-underline-position</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-origin-right">in css-transforms-1, for transform-origin</a>
      </ul>
     <li>
      round
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-round">in css-backgrounds-3, for background-repeat</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-repeat-round">in css-backgrounds-3, for border-image-repeat</a>
      </ul>
     <li>
      row
      <ul>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-direction-row">in css-flexbox-1, for flex-direction</a>
       <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-auto-flow-row">in css-grid-1, for grid-auto-flow</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-row-resize">row-resize</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-direction-row-reverse">row-reverse</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-direction-rtl">rtl</a>
     <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-play-state-running">running</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#s">s</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#valdef-overflow-position-safe">safe</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-saturation">saturation</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-object-fit-scale-down">scale-down</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-screen">screen</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-attachment-scroll">scroll</a>
     <li><a href="https://drafts.csswg.org/css-will-change-1/#valdef-will-change-scroll-position">scroll-position</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-self-end">self-end</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-self-start">self-start</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-se-resize">se-resize</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-style-sesame">sesame</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-orientation-sideways">sideways</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-orientation-sideways-right">sideways-right</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#simp-chinese-formal">simp-chinese-formal</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#simp-chinese-informal">simp-chinese-informal</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-radial-gradient-size">&lt;size></a>
     <li><a href="https://drafts.csswg.org/css-break-3/#valdef-box-decoration-break-slice">slice</a>
     <li><a href="https://drafts.csswg.org/css-images-3/#valdef-image-rendering-smooth">smooth</a>
     <li><a href="https://drafts.fxtf.org/compositing-1/#valdef-blend-mode-soft-light">soft-light</a>
     <li>
      solid
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-style-solid">in css-backgrounds-3, for &lt;line-style>, border-style, border-top-style, border-left-style, border-bottom-style, border-right-style, border</a>
       <li><a href="https://drafts.csswg.org/css2/box.html#value-def-solid">in css2</a>
      </ul>
     <li>
      space
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-repeat-space">in css-backgrounds-3, for background-repeat</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-repeat-space">in css-backgrounds-3, for border-image-repeat</a>
      </ul>
     <li>
      space-around
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-content-space-around">in css-align-3, for align-content, justify-content, &lt;content-distribution></a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-space-around">in css-flexbox-1, for align-content</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-justify-content-space-around">in css-flexbox-1, for justify-content</a>
      </ul>
     <li>
      space-between
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-content-space-between">in css-align-3, for align-content, justify-content, &lt;content-distribution></a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-space-between">in css-flexbox-1, for align-content</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-justify-content-space-between">in css-flexbox-1, for justify-content</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-content-space-evenly">space-evenly</a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#grid-placement-span-int">span &amp;&amp; [ &lt;integer> || &lt;custom-ident> ]</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-spell-out">spell-out</a>
     <li>
      square
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#square">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-square">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-s-resize">s-resize</a>
     <li><a href="https://drafts.fxtf.org/filter-effects-1/#valdef-color-interpolation-filters-srgb">srgb</a>
     <li>
      start
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-self-position-start">in css-align-3, for &lt;self-position>, &lt;content-position></a>
       <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-align-start">in css-text-3, for text-align</a>
      </ul>
     <li>
      stretch
      <ul>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-content-stretch">in css-align-3, for align-content, justify-content, &lt;content-distribution></a>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-align-self-stretch">in css-align-3, for align-self</a>
       <li><a href="https://drafts.csswg.org/css-align-3/#valdef-justify-self-stretch">in css-align-3, for justify-self</a>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-border-image-repeat-stretch">in css-backgrounds-3, for border-image-repeat</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-content-stretch">in css-flexbox-1, for align-content</a>
       <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-stretch">in css-flexbox-1, for align-items, align-self</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-line-break-strict">strict</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-style-string">&lt;string></a>
     <li><a href="https://drafts.csswg.org/css-grid-1/#valdef-grid-template-areas-string">&lt;string>+</a>
     <li>
      stroke-box
      <ul>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clip-path-stroke-box">in css-masking-1, for clip-path</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-stroke-box">in css-masking-1, for mask-clip</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-stroke-box">in css-masking-1, for mask-origin</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-box-stroke-box">in css-transforms-1, for transform-box</a>
      </ul>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-composite-subtract">subtract</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-sw-resize">sw-resize</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-system-symbolic">symbolic</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#value-def-table">table</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#value-def-table-caption">table-caption</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#value-def-table-cell">table-cell</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#value-def-table-column">table-column</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#value-def-table-column-group">table-column-group</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#value-def-table-footer-group">table-footer-group</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#value-def-table-header-group">table-header-group</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#value-def-table-row">table-row</a>
     <li><a href="https://drafts.csswg.org/css2/tables.html#value-def-table-row-group">table-row-group</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-tamil">tamil</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-telugu">telugu</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-text">text</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-thai">thai</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-width-thick">thick</a>
     <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-line-width-thin">thin</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-tibetan">tibetan</a>
     <li>
      &lt;time>
      <ul>
       <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-delay-time">in css-animations-1, for animation-delay</a>
       <li><a href="https://drafts.csswg.org/css-animations-1/#valdef-animation-duration-time">in css-animations-1, for animation-duration</a>
      </ul>
     <li>
      top
      <ul>
       <li><a href="https://drafts.csswg.org/css-backgrounds-3/#valdef-background-position-top">in css-backgrounds-3, for background-position</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-origin-top">in css-transforms-1, for transform-origin</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-grid-1/#track-listing">&lt;track-list> | &lt;auto-track-list></a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#trad-chinese-formal">trad-chinese-formal</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#trad-chinese-informal">trad-chinese-informal</a>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-style-triangle">triangle</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#turn">turn</a>
     <li>
      under
      <ul>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-text-emphasis-position-under">in css-text-decor-3, for text-text-emphasis-position</a>
       <li><a href="https://drafts.csswg.org/css-text-decor-3/#underline-under">in css-text-decor-3, for text-underline-position</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-text-decor-3/#valdef-text-decoration-line-underline">underline</a>
     <li><a href="https://drafts.csswg.org/css-align-3/#valdef-overflow-position-unsafe">unsafe</a>
     <li><a href="https://drafts.csswg.org/css-cascade-3/#valdef-all-unset">unset</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#upper-alpha">upper-alpha</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-name-upper-armenian">upper-armenian</a>
     <li><a href="https://drafts.csswg.org/css-text-3/#valdef-text-transform-uppercase">uppercase</a>
     <li>
      upper-latin
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#upper-latin">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-upper-latin">in css2</a>
      </ul>
     <li>
      upper-roman
      <ul>
       <li><a href="https://drafts.csswg.org/css-counter-styles-3/#upper-roman">in css-counter-styles-3, for &lt;counter-style-name></a>
       <li><a href="https://drafts.csswg.org/css2/generate.html#value-def-upper-roman">in css2</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-text-orientation-upright">upright</a>
     <li><a href="https://drafts.csswg.org/css-fonts-3/#urange-value">&lt;urange></a>
     <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-image-url">&lt;url></a>
     <li>
      userspaceonuse
      <ul>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clippathunits-userspaceonuse">in css-masking-1, for clipPathUnits</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-maskcontentunits-userspaceonuse">in css-masking-1, for maskContentUnits</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-maskunits-userspaceonuse">in css-masking-1, for maskUnits</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-break-3/#valdef-break-before-verso">verso</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-writing-mode-vertical-lr">vertical-lr</a>
     <li><a href="https://drafts.csswg.org/css-writing-modes-3/#valdef-writing-mode-vertical-rl">vertical-rl</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-vertical-text">vertical-text</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#vh">vh</a>
     <li>
      view-box
      <ul>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-clip-path-view-box">in css-masking-1, for clip-path</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-clip-view-box">in css-masking-1, for mask-clip</a>
       <li><a href="https://drafts.fxtf.org/css-masking-1/#valdef-mask-origin-view-box">in css-masking-1, for mask-origin</a>
       <li><a href="https://drafts.csswg.org/css-transforms-1/#valdef-transform-box-view-box">in css-transforms-1, for transform-box</a>
      </ul>
     <li><a href="https://drafts.csswg.org/css-values-3/#vmax">vmax</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#vmin">vmin</a>
     <li><a href="https://drafts.csswg.org/css-values-3/#vw">vw</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-wait">wait</a>
     <li><a href="https://drafts.csswg.org/css-counter-styles-3/#valdef-counter-style-speak-as-words">words</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-wrap-wrap">wrap</a>
     <li><a href="https://drafts.csswg.org/css-flexbox-1/#valdef-flex-wrap-wrap-reverse">wrap-reverse</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-w-resize">w-resize</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-zoom-in">zoom-in</a>
     <li><a href="https://drafts.csswg.org/css-ui-3/#valdef-cursor-zoom-out">zoom-out</a>
    </ul>
   </div>
   <h2 class="heading settled" data-level="5" id="acks"><span class="secno">5. </span><span class="content">Acknowledgements</span><a class="self-link" href="#acks"></a></h2>
   <p>Special thanks to Florian Rivoal for creating the initial draft of the <a href="#experimental">§ 3.2.1 Experimentation and Unstable Features</a> recommendations.</p>
  </main>
  <h2 class="no-ref no-num heading settled" id="conformance"><span class="content"> Conformance</span><a class="self-link" href="#conformance"></a></h2>
  <h3 class="heading settled" id="document-conventions"><span class="content"> Document conventions</span><a class="self-link" href="#document-conventions"></a></h3>
  <p>Conformance requirements are expressed with a combination of
	descriptive assertions and RFC 2119 terminology. The key words “MUST”,
	“MUST NOT”, “REQUIRED”, “SHALL”, “SHALL NOT”, “SHOULD”, “SHOULD NOT”,
	“RECOMMENDED”, “MAY”, and “OPTIONAL” in the normative parts of this
	document are to be interpreted as described in RFC 2119.
	However, for readability, these words do not appear in all uppercase
	letters in this specification. </p>
  <p>All of the text of this specification is normative except sections
	explicitly marked as non-normative, examples, and notes. <a data-link-type="biblio" href="#biblio-rfc2119">[RFC2119]</a> </p>
  <p>Examples in this specification are introduced with the words “for example”
	or are set apart from the normative text with <code>class="example"</code>,
	like this: </p>
  <div class="example" id="example-ae2b6bc0">
   <a class="self-link" href="#example-ae2b6bc0"></a> 
   <p>This is an example of an informative example. </p>
  </div>
  <p>Informative notes begin with the word “Note” and are set apart from the
	normative text with <code>class="note"</code>, like this: </p>
  <p class="note" role="note">Note, this is an informative note. </p>
  <p>Advisements are normative sections styled to evoke special attention and are
	set apart from other normative text with <code>&lt;strong class="advisement"></code>, like
	this: <strong class="advisement"> UAs MUST provide an accessible alternative. </strong> </p>
  <h3 class="heading settled" id="conform-classes"><span class="content"> Conformance classes</span><a class="self-link" href="#conform-classes"></a></h3>
  <p>Conformance to this specification
	is defined for three conformance classes: </p>
  <dl>
   <dt>style sheet 
   <dd>A <a href="http://www.w3.org/TR/CSS2/conform.html#style-sheet">CSS
			style sheet</a>. 
   <dt>renderer 
   <dd>A <a href="http://www.w3.org/TR/CSS2/conform.html#user-agent">UA</a> that interprets the semantics of a style sheet and renders
			documents that use them. 
   <dt>authoring tool 
   <dd>A <a href="http://www.w3.org/TR/CSS2/conform.html#user-agent">UA</a> that writes a style sheet. 
  </dl>
  <p>A style sheet is conformant to this specification
	if all of its statements that use syntax defined in this module are valid
	according to the generic CSS grammar and the individual grammars of each
	feature defined in this module. </p>
  <p>A renderer is conformant to this specification
	if, in addition to interpreting the style sheet as defined by the
	appropriate specifications, it supports all the features defined
	by this specification by parsing them correctly
	and rendering the document accordingly. However, the inability of a
	UA to correctly render a document due to limitations of the device
	does not make the UA non-conformant. (For example, a UA is not
	required to render color on a monochrome monitor.) </p>
  <p>An authoring tool is conformant to this specification
	if it writes style sheets that are syntactically correct according to the
	generic CSS grammar and the individual grammars of each feature in
	this module, and meet all other conformance requirements of style sheets
	as described in this module. </p>
  <h3 class="heading settled" id="conform-responsible"><span class="content"> Requirements for Responsible Implementation of CSS</span><a class="self-link" href="#conform-responsible"></a></h3>
  <p>The following sections define several conformance requirements
		for implementing CSS responsibly,
		in a way that promotes interoperability in the present and future. </p>
  <h4 class="heading settled" id="conform-partial"><span class="content"> Partial Implementations</span><a class="self-link" href="#conform-partial"></a></h4>
  <p>So that authors can exploit the forward-compatible parsing rules to assign fallback values, <strong>CSS renderers <em>must</em> treat as invalid
		(and <a href="http://www.w3.org/TR/CSS2/conform.html#ignore">ignore as appropriate</a>)
		any at-rules, properties, property values, keywords, and other syntactic constructs
		for which they have no usable level of support</strong>.
		In particular, user agents <em>must not</em> selectively ignore
		unsupported property values and honor supported values in a single multi-value property declaration:
		if any value is considered invalid (as unsupported values must be),
		CSS requires that the entire declaration be ignored. </p>
  <h4 class="heading settled" id="conform-future-proofing"><span class="content"> Implementations of Unstable and Proprietary Features</span><a class="self-link" href="#conform-future-proofing"></a></h4>
  <p>To avoid clashes with future stable CSS features,
		the CSSWG recommends <a href="http://www.w3.org/TR/CSS/#future-proofing">following best practices</a> for the implementation of <a href="http://www.w3.org/TR/CSS/#unstable">unstable</a> features and <a href="http://www.w3.org/TR/CSS/#proprietary-extension">proprietary extensions</a> to CSS. </p>
  <h4 class="heading settled" id="conform-testing"><span class="content"> Implementations of CR-level Features</span><a class="self-link" href="#conform-testing"></a></h4>
  <p>Once a specification reaches the Candidate Recommendation stage,
		implementers should release an <a data-link-type="dfn" href="http://www.w3.org/TR/CSS/#vendor-prefix">unprefixed</a> implementation
		of any CR-level feature they can demonstrate
		to be correctly implemented according to spec,
		and should avoid exposing a prefixed variant of that feature. </p>
  <p>To establish and maintain the interoperability of CSS across
		implementations, the CSS Working Group requests that non-experimental
		CSS renderers submit an implementation report (and, if necessary, the
		testcases used for that implementation report) to the W3C before
		releasing an unprefixed implementation of any CSS features. Testcases
		submitted to W3C are subject to review and correction by the CSS
		Working Group. </p>
  <p>
   Further information on submitting testcases and implementation reports
		can be found from on the CSS Working Group’s website at <a href="http://www.w3.org/Style/CSS/Test/">http://www.w3.org/Style/CSS/Test/</a>.
		Questions should be directed to the <a href="http://lists.w3.org/Archives/Public/public-css-testsuite">public-css-testsuite@w3.org</a> mailing list. 
<script src="https://www.w3.org/scripts/TR/2016/fixup.js"></script>
  </p>
  <h2 class="no-num no-ref heading settled" id="index"><span class="content">Index</span><a class="self-link" href="#index"></a></h2>
  <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="content">Terms defined by this specification</span><a class="self-link" href="#index-defined-here"></a></h3>
  <ul class="index">
   <li><a href="#cascading-style-sheets-css">Cascading Style Sheets (CSS)</a><span>, in §2</span>
   <li><a href="#css-level-1">CSS Level 1</a><span>, in §2.1</span>
   <li><a href="#css-level-2">CSS Level 2</a><span>, in §2.1</span>
   <li><a href="#css-level-3">CSS Level 3</a><span>, in §2.1</span>
   <li><a href="#css-level-4">CSS Level 4</a><span>, in §2.1</span>
   <li><a href="#editors-draft">Editor’s Draft</a><span>, in §1.1</span>
   <li><a href="#levels">levels</a><span>, in §2.1</span>
   <li><a href="#vendor-prefix">prefixed</a><span>, in §3.2.2</span>
   <li><a href="#proprietary-extension">proprietary extension</a><span>, in §3.2.2</span>
   <li><a href="#rough-interoperability">Rough interoperability</a><span>, in §3.2.3</span>
   <li><a href="#vendor-prefix">unprefixed</a><span>, in §3.2.2</span>
   <li><a href="#unstable">unstable</a><span>, in §3.2.1</span>
   <li><a href="#vendor-prefix">vendor prefix</a><span>, in §3.2.2</span>
   <li><a href="#vendor-prefix">vendor-prefixed</a><span>, in §3.2.2</span>
  </ul>
  <aside class="dfn-panel" data-for="term-for-propdef-opacity">
   <a href="https://www.w3.org/TR/css-color-4/#propdef-opacity">https://www.w3.org/TR/css-color-4/#propdef-opacity</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-propdef-opacity">2. Cascading Style Sheets (CSS) — The Official Definition</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-typedef-counter-style">
   <a href="https://www.w3.org/TR/css-counter-styles-3/#typedef-counter-style">https://www.w3.org/TR/css-counter-styles-3/#typedef-counter-style</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-typedef-counter-style">2. Cascading Style Sheets (CSS) — The Official Definition</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-at-ruledef-counter-style">
   <a href="https://www.w3.org/TR/css-counter-styles-3/#at-ruledef-counter-style">https://www.w3.org/TR/css-counter-styles-3/#at-ruledef-counter-style</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-at-ruledef-counter-style">2. Cascading Style Sheets (CSS) — The Official Definition</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-valdef-width-max-content">
   <a href="https://www.w3.org/TR/css-sizing-3/#valdef-width-max-content">https://www.w3.org/TR/css-sizing-3/#valdef-width-max-content</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-valdef-width-max-content">3.2.1. 
Experimentation and Unstable Features</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-valdef-width-min-content">
   <a href="https://www.w3.org/TR/css-sizing-3/#valdef-width-min-content">https://www.w3.org/TR/css-sizing-3/#valdef-width-min-content</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-valdef-width-min-content">3.2.1. 
Experimentation and Unstable Features</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-propdef-cursor">
   <a href="https://www.w3.org/TR/css3-ui/#propdef-cursor">https://www.w3.org/TR/css3-ui/#propdef-cursor</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-propdef-cursor">2. Cascading Style Sheets (CSS) — The Official Definition</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-propdef-outline">
   <a href="https://www.w3.org/TR/css3-ui/#propdef-outline">https://www.w3.org/TR/css3-ui/#propdef-outline</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-propdef-outline">2. Cascading Style Sheets (CSS) — The Official Definition</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-propdef-will-change">
   <a href="https://www.w3.org/TR/css-will-change-1/#propdef-will-change">https://www.w3.org/TR/css-will-change-1/#propdef-will-change</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-propdef-will-change">2. Cascading Style Sheets (CSS) — The Official Definition</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-at-ruledef-media">
   <a href="https://drafts.csswg.org/css-conditional-3/#at-ruledef-media">https://drafts.csswg.org/css-conditional-3/#at-ruledef-media</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-at-ruledef-media">2. Cascading Style Sheets (CSS) — The Official Definition</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-at-ruledef-supports">
   <a href="https://drafts.csswg.org/css-conditional-3/#at-ruledef-supports">https://drafts.csswg.org/css-conditional-3/#at-ruledef-supports</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-at-ruledef-supports">2. Cascading Style Sheets (CSS) — The Official Definition</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-dir-pseudo">
   <a href="https://www.w3.org/TR/selectors4/#dir-pseudo">https://www.w3.org/TR/selectors4/#dir-pseudo</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-dir-pseudo">3.2.1. 
Experimentation and Unstable Features</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="term-for-lang-pseudo">
   <a href="https://www.w3.org/TR/selectors4/#lang-pseudo">https://www.w3.org/TR/selectors4/#lang-pseudo</a><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-lang-pseudo">3.2.1. 
Experimentation and Unstable Features</a>
   </ul>
  </aside>
  <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span class="content">Terms defined by reference</span><a class="self-link" href="#index-defined-elsewhere"></a></h3>
  <ul class="index">
   <li>
    <a data-link-type="biblio">[css-color-4]</a> defines the following terms:
    <ul>
     <li><span class="dfn-paneled" id="term-for-propdef-opacity" style="color:initial">opacity</span>
    </ul>
   <li>
    <a data-link-type="biblio">[CSS-COUNTER-STYLES-3]</a> defines the following terms:
    <ul>
     <li><span class="dfn-paneled" id="term-for-typedef-counter-style" style="color:initial">&lt;counter-style></span>
     <li><span class="dfn-paneled" id="term-for-at-ruledef-counter-style" style="color:initial">@counter-style</span>
    </ul>
   <li>
    <a data-link-type="biblio">[CSS-SIZING-3]</a> defines the following terms:
    <ul>
     <li><span class="dfn-paneled" id="term-for-valdef-width-max-content" style="color:initial">max-content</span>
     <li><span class="dfn-paneled" id="term-for-valdef-width-min-content" style="color:initial">min-content</span>
    </ul>
   <li>
    <a data-link-type="biblio">[CSS-UI-3]</a> defines the following terms:
    <ul>
     <li><span class="dfn-paneled" id="term-for-propdef-cursor" style="color:initial">cursor</span>
     <li><span class="dfn-paneled" id="term-for-propdef-outline" style="color:initial">outline</span>
    </ul>
   <li>
    <a data-link-type="biblio">[CSS-WILL-CHANGE-1]</a> defines the following terms:
    <ul>
     <li><span class="dfn-paneled" id="term-for-propdef-will-change" style="color:initial">will-change</span>
    </ul>
   <li>
    <a data-link-type="biblio">[CSS3-CONDITIONAL]</a> defines the following terms:
    <ul>
     <li><span class="dfn-paneled" id="term-for-at-ruledef-media" style="color:initial">@media</span>
     <li><span class="dfn-paneled" id="term-for-at-ruledef-supports" style="color:initial">@supports</span>
    </ul>
   <li>
    <a data-link-type="biblio">[SELECTORS4]</a> defines the following terms:
    <ul>
     <li><span class="dfn-paneled" id="term-for-dir-pseudo" style="color:initial">:dir()</span>
     <li><span class="dfn-paneled" id="term-for-lang-pseudo" style="color:initial">:lang()</span>
    </ul>
  </ul>
  <h2 class="no-num no-ref heading settled" id="references"><span class="content">References</span><a class="self-link" href="#references"></a></h2>
  <h3 class="no-num no-ref heading settled" id="normative"><span class="content">Normative References</span><a class="self-link" href="#normative"></a></h3>
  <dl>
   <dt id="biblio-compositing">[COMPOSITING]
   <dd>Rik Cabanier; Nikos Andronikos. <a href="https://www.w3.org/TR/compositing-1/">Compositing and Blending Level 1</a>. 13 January 2015. CR. URL: <a href="https://www.w3.org/TR/compositing-1/">https://www.w3.org/TR/compositing-1/</a>
   <dt id="biblio-css-cascade-3">[CSS-CASCADE-3]
   <dd>Elika Etemad; Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-cascade-3/">CSS Cascading and Inheritance Level 3</a>. 28 August 2018. CR. URL: <a href="https://www.w3.org/TR/css-cascade-3/">https://www.w3.org/TR/css-cascade-3/</a>
   <dt id="biblio-css-color-4">[CSS-COLOR-4]
   <dd>Tab Atkins Jr.; Chris Lilley. <a href="https://www.w3.org/TR/css-color-4/">CSS Color Module Level 4</a>. 5 March 2019. WD. URL: <a href="https://www.w3.org/TR/css-color-4/">https://www.w3.org/TR/css-color-4/</a>
   <dt id="biblio-css-fonts-3">[CSS-FONTS-3]
   <dd>John Daggett; Myles Maxfield; Chris Lilley. <a href="https://www.w3.org/TR/css-fonts-3/">CSS Fonts Module Level 3</a>. 20 September 2018. REC. URL: <a href="https://www.w3.org/TR/css-fonts-3/">https://www.w3.org/TR/css-fonts-3/</a>
   <dt id="biblio-css-sizing-3">[CSS-SIZING-3]
   <dd>Tab Atkins Jr.; Elika Etemad. <a href="https://www.w3.org/TR/css-sizing-3/">CSS Intrinsic &amp; Extrinsic Sizing Module Level 3</a>. 22 May 2019. WD. URL: <a href="https://www.w3.org/TR/css-sizing-3/">https://www.w3.org/TR/css-sizing-3/</a>
   <dt id="biblio-css-style-attr">[CSS-STYLE-ATTR]
   <dd>Tantek Çelik; Elika Etemad. <a href="https://www.w3.org/TR/css-style-attr/">CSS Style Attributes</a>. 7 November 2013. REC. URL: <a href="https://www.w3.org/TR/css-style-attr/">https://www.w3.org/TR/css-style-attr/</a>
   <dt id="biblio-css-syntax-3">[CSS-SYNTAX-3]
   <dd>Tab Atkins Jr.; Simon Sapin. <a href="https://www.w3.org/TR/css-syntax-3/">CSS Syntax Module Level 3</a>. 20 February 2014. CR. URL: <a href="https://www.w3.org/TR/css-syntax-3/">https://www.w3.org/TR/css-syntax-3/</a>
   <dt id="biblio-css-ui-3">[CSS-UI-3]
   <dd>Tantek Çelik; Florian Rivoal. <a href="https://www.w3.org/TR/css-ui-3/">CSS Basic User Interface Module Level 3 (CSS3 UI)</a>. 21 June 2018. REC. URL: <a href="https://www.w3.org/TR/css-ui-3/">https://www.w3.org/TR/css-ui-3/</a>
   <dt id="biblio-css-values-3">[CSS-VALUES-3]
   <dd>Tab Atkins Jr.; Elika Etemad. <a href="https://www.w3.org/TR/css-values-3/">CSS Values and Units Module Level 3</a>. 31 January 2019. CR. URL: <a href="https://www.w3.org/TR/css-values-3/">https://www.w3.org/TR/css-values-3/</a>
   <dt id="biblio-css-writing-modes-3">[CSS-WRITING-MODES-3]
   <dd>Elika Etemad; Koji Ishii. <a href="https://www.w3.org/TR/css-writing-modes-3/">CSS Writing Modes Level 3</a>. 24 May 2018. CR. URL: <a href="https://www.w3.org/TR/css-writing-modes-3/">https://www.w3.org/TR/css-writing-modes-3/</a>
   <dt id="biblio-css2">[CSS2]
   <dd>Bert Bos; et al. <a href="https://www.w3.org/TR/CSS2/">Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification</a>. 7 June 2011. REC. URL: <a href="https://www.w3.org/TR/CSS2/">https://www.w3.org/TR/CSS2/</a>
   <dt id="biblio-css3-animations">[CSS3-ANIMATIONS]
   <dd>Dean Jackson; et al. <a href="https://www.w3.org/TR/css-animations-1/">CSS Animations Level 1</a>. 11 October 2018. WD. URL: <a href="https://www.w3.org/TR/css-animations-1/">https://www.w3.org/TR/css-animations-1/</a>
   <dt id="biblio-css3-background">[CSS3-BACKGROUND]
   <dd>Bert Bos; Elika Etemad; Brad Kemper. <a href="https://www.w3.org/TR/css-backgrounds-3/">CSS Backgrounds and Borders Module Level 3</a>. 17 October 2017. CR. URL: <a href="https://www.w3.org/TR/css-backgrounds-3/">https://www.w3.org/TR/css-backgrounds-3/</a>
   <dt id="biblio-css3-color">[CSS3-COLOR]
   <dd>Tantek Çelik; Chris Lilley; David Baron. <a href="https://www.w3.org/TR/css-color-3/">CSS Color Module Level 3</a>. 19 June 2018. REC. URL: <a href="https://www.w3.org/TR/css-color-3/">https://www.w3.org/TR/css-color-3/</a>
   <dt id="biblio-css3-conditional">[CSS3-CONDITIONAL]
   <dd>David Baron. <a href="https://www.w3.org/TR/css3-conditional/">CSS Conditional Rules Module Level 3</a>. 4 April 2013. CR. URL: <a href="https://www.w3.org/TR/css3-conditional/">https://www.w3.org/TR/css3-conditional/</a>
   <dt id="biblio-css3-images">[CSS3-IMAGES]
   <dd>Elika Etemad; Tab Atkins Jr.. <a href="https://www.w3.org/TR/css3-images/">CSS Image Values and Replaced Content Module Level 3</a>. 17 April 2012. CR. URL: <a href="https://www.w3.org/TR/css3-images/">https://www.w3.org/TR/css3-images/</a>
   <dt id="biblio-css3-mediaqueries">[CSS3-MEDIAQUERIES]
   <dd>Florian Rivoal; et al. <a href="https://www.w3.org/TR/css3-mediaqueries/">Media Queries</a>. 19 June 2012. REC. URL: <a href="https://www.w3.org/TR/css3-mediaqueries/">https://www.w3.org/TR/css3-mediaqueries/</a>
   <dt id="biblio-css3-multicol">[CSS3-MULTICOL]
   <dd>Florian Rivoal; Rachel Andrew. <a href="https://www.w3.org/TR/css-multicol-1/">CSS Multi-column Layout Module Level 1</a>. 28 May 2018. WD. URL: <a href="https://www.w3.org/TR/css-multicol-1/">https://www.w3.org/TR/css-multicol-1/</a>
   <dt id="biblio-css3-namespace">[CSS3-NAMESPACE]
   <dd>Elika Etemad. <a href="https://www.w3.org/TR/css-namespaces-3/">CSS Namespaces Module Level 3</a>. 20 March 2014. REC. URL: <a href="https://www.w3.org/TR/css-namespaces-3/">https://www.w3.org/TR/css-namespaces-3/</a>
   <dt id="biblio-css3-transforms">[CSS3-TRANSFORMS]
   <dd>Simon Fraser; et al. <a href="https://www.w3.org/TR/css-transforms-1/">CSS Transforms Module Level 1</a>. 14 February 2019. CR. URL: <a href="https://www.w3.org/TR/css-transforms-1/">https://www.w3.org/TR/css-transforms-1/</a>
   <dt id="biblio-css3-transitions">[CSS3-TRANSITIONS]
   <dd>David Baron; et al. <a href="https://www.w3.org/TR/css-transitions-1/">CSS Transitions</a>. 11 October 2018. WD. URL: <a href="https://www.w3.org/TR/css-transitions-1/">https://www.w3.org/TR/css-transitions-1/</a>
   <dt id="biblio-rfc2119">[RFC2119]
   <dd>S. Bradner. <a href="https://tools.ietf.org/html/rfc2119">Key words for use in RFCs to Indicate Requirement Levels</a>. March 1997. Best Current Practice. URL: <a href="https://tools.ietf.org/html/rfc2119">https://tools.ietf.org/html/rfc2119</a>
   <dt id="biblio-select">[SELECT]
   <dd>Tantek Çelik; et al. <a href="https://www.w3.org/TR/selectors-3/">Selectors Level 3</a>. 6 November 2018. REC. URL: <a href="https://www.w3.org/TR/selectors-3/">https://www.w3.org/TR/selectors-3/</a>
   <dt id="biblio-selectors4">[SELECTORS4]
   <dd>Elika Etemad; Tab Atkins Jr.. <a href="https://www.w3.org/TR/selectors-4/">Selectors Level 4</a>. 21 November 2018. WD. URL: <a href="https://www.w3.org/TR/selectors-4/">https://www.w3.org/TR/selectors-4/</a>
  </dl>
  <h3 class="no-num no-ref heading settled" id="informative"><span class="content">Informative References</span><a class="self-link" href="#informative"></a></h3>
  <dl>
   <dt id="biblio-css-align-3">[CSS-ALIGN-3]
   <dd>Elika Etemad; Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-align-3/">CSS Box Alignment Module Level 3</a>. 6 December 2018. WD. URL: <a href="https://www.w3.org/TR/css-align-3/">https://www.w3.org/TR/css-align-3/</a>
   <dt id="biblio-css-break-3">[CSS-BREAK-3]
   <dd>Rossen Atanassov; Elika Etemad. <a href="https://www.w3.org/TR/css-break-3/">CSS Fragmentation Module Level 3</a>. 4 December 2018. CR. URL: <a href="https://www.w3.org/TR/css-break-3/">https://www.w3.org/TR/css-break-3/</a>
   <dt id="biblio-css-counter-styles-3">[CSS-COUNTER-STYLES-3]
   <dd>Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-counter-styles-3/">CSS Counter Styles Level 3</a>. 14 December 2017. CR. URL: <a href="https://www.w3.org/TR/css-counter-styles-3/">https://www.w3.org/TR/css-counter-styles-3/</a>
   <dt id="biblio-css-flexbox-1">[CSS-FLEXBOX-1]
   <dd>Tab Atkins Jr.; et al. <a href="https://www.w3.org/TR/css-flexbox-1/">CSS Flexible Box Layout Module Level 1</a>. 19 November 2018. CR. URL: <a href="https://www.w3.org/TR/css-flexbox-1/">https://www.w3.org/TR/css-flexbox-1/</a>
   <dt id="biblio-css-grid-1">[CSS-GRID-1]
   <dd>Tab Atkins Jr.; Elika Etemad; Rossen Atanassov. <a href="https://www.w3.org/TR/css-grid-1/">CSS Grid Layout Module Level 1</a>. 14 December 2017. CR. URL: <a href="https://www.w3.org/TR/css-grid-1/">https://www.w3.org/TR/css-grid-1/</a>
   <dt id="biblio-css-masking-1">[CSS-MASKING-1]
   <dd>Dirk Schulze; Brian Birtles; Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-masking-1/">CSS Masking Module Level 1</a>. 26 August 2014. CR. URL: <a href="https://www.w3.org/TR/css-masking-1/">https://www.w3.org/TR/css-masking-1/</a>
   <dt id="biblio-css-shapes-1">[CSS-SHAPES-1]
   <dd>Vincent Hardy; Rossen Atanassov; Alan Stearns. <a href="https://www.w3.org/TR/css-shapes-1/">CSS Shapes Module Level 1</a>. 20 March 2014. CR. URL: <a href="https://www.w3.org/TR/css-shapes-1/">https://www.w3.org/TR/css-shapes-1/</a>
   <dt id="biblio-css-text-3">[CSS-TEXT-3]
   <dd>Elika Etemad; Koji Ishii; Florian Rivoal. <a href="https://www.w3.org/TR/css-text-3/">CSS Text Module Level 3</a>. 12 December 2018. WD. URL: <a href="https://www.w3.org/TR/css-text-3/">https://www.w3.org/TR/css-text-3/</a>
   <dt id="biblio-css-text-decor-3">[CSS-TEXT-DECOR-3]
   <dd>Elika Etemad; Koji Ishii. <a href="https://www.w3.org/TR/css-text-decor-3/">CSS Text Decoration Module Level 3</a>. 3 July 2018. CR. URL: <a href="https://www.w3.org/TR/css-text-decor-3/">https://www.w3.org/TR/css-text-decor-3/</a>
   <dt id="biblio-css-variables-1">[CSS-VARIABLES-1]
   <dd>Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-variables-1/">CSS Custom Properties for Cascading Variables Module Level 1</a>. 3 December 2015. CR. URL: <a href="https://www.w3.org/TR/css-variables-1/">https://www.w3.org/TR/css-variables-1/</a>
   <dt id="biblio-css-will-change-1">[CSS-WILL-CHANGE-1]
   <dd>Tab Atkins Jr.. <a href="https://www.w3.org/TR/css-will-change-1/">CSS Will Change Module Level 1</a>. 3 December 2015. CR. URL: <a href="https://www.w3.org/TR/css-will-change-1/">https://www.w3.org/TR/css-will-change-1/</a>
   <dt id="biblio-css3-speech">[CSS3-SPEECH]
   <dd>Daniel Weck. <a href="https://www.w3.org/TR/css3-speech/">CSS Speech Module</a>. 5 June 2018. NOTE. URL: <a href="https://www.w3.org/TR/css3-speech/">https://www.w3.org/TR/css3-speech/</a>
   <dt id="biblio-filter-effects-1">[FILTER-EFFECTS-1]
   <dd>Dirk Schulze; Dean Jackson. <a href="https://www.w3.org/TR/filter-effects-1/">Filter Effects Module Level 1</a>. 18 December 2018. WD. URL: <a href="https://www.w3.org/TR/filter-effects-1/">https://www.w3.org/TR/filter-effects-1/</a>
  </dl>
  <aside class="dfn-panel" data-for="editors-draft">
   <b><a href="#editors-draft">#editors-draft</a></b><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-editors-draft">1.1. 
Background: The W3C Process and CSS</a> <a href="#ref-for-editors-draft①">(2)</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="css-level-1">
   <b><a href="#css-level-1">#css-level-1</a></b><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-css-level-1">2.1. 
CSS Levels</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="css-level-2">
   <b><a href="#css-level-2">#css-level-2</a></b><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-css-level-2">2.1. 
CSS Levels</a> <a href="#ref-for-css-level-2①">(2)</a> <a href="#ref-for-css-level-2②">(3)</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="css-level-3">
   <b><a href="#css-level-3">#css-level-3</a></b><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-css-level-3">2.1. 
CSS Levels</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="unstable">
   <b><a href="#unstable">#unstable</a></b><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-unstable">3.2. Implementations of Unstable and Proprietary Features</a>
    <li><a href="#ref-for-unstable①">3.2.1. 
Experimentation and Unstable Features</a> <a href="#ref-for-unstable②">(2)</a>
    <li><a href="#ref-for-unstable③">3.2.3. 
Market Pressure and De Facto Standards</a> <a href="#ref-for-unstable④">(2)</a>
    <li><a href="#ref-for-unstable⑤">3.2.3.1. 
Vendor-prefixing Unstable Features</a> <a href="#ref-for-unstable⑥">(2)</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="vendor-prefix">
   <b><a href="#vendor-prefix">#vendor-prefix</a></b><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-vendor-prefix">3.2.2. 
Proprietary and Non-standardized Features</a>
    <li><a href="#ref-for-vendor-prefix①">3.2.3. 
Market Pressure and De Facto Standards</a>
    <li><a href="#ref-for-vendor-prefix②">3.2.3.1. 
Vendor-prefixing Unstable Features</a> <a href="#ref-for-vendor-prefix③">(2)</a> <a href="#ref-for-vendor-prefix④">(3)</a>
    <li><a href="#ref-for-vendor-prefix⑤">3.3. Implementations of CR-level Features</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="proprietary-extension">
   <b><a href="#proprietary-extension">#proprietary-extension</a></b><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-proprietary-extension">3.2. Implementations of Unstable and Proprietary Features</a>
    <li><a href="#ref-for-proprietary-extension①">3.2.2. 
Proprietary and Non-standardized Features</a> <a href="#ref-for-proprietary-extension②">(2)</a> <a href="#ref-for-proprietary-extension③">(3)</a>
   </ul>
  </aside>
  <aside class="dfn-panel" data-for="rough-interoperability">
   <b><a href="#rough-interoperability">#rough-interoperability</a></b><b>Referenced in:</b>
   <ul>
    <li><a href="#ref-for-rough-interoperability">2. Cascading Style Sheets (CSS) — The Official Definition</a>
    <li><a href="#ref-for-rough-interoperability①">3.2.3. 
Market Pressure and De Facto Standards</a>
   </ul>
  </aside>
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